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<!-- Weave of 'Terms' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Services< / a > < / li > < li > < a href = "index.html" > calculus< / a > < / li > < li > < a href = "index.html#4" > Chapter 4: Propositions< / a > < / li > < li > < b > Terms< / b > < / li > < / ul > < / div >
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< p class = "purpose" > Terms are the representations of values in predicate calculus: variables, constants or functions of other terms.< / p >
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< ul class = "toc" > < li > < a href = "4-trm.html#SP1" > § 1. About terms< / a > < / li > < li > < a href = "4-trm.html#SP4" > § 4. Creating new terms< / a > < / li > < li > < a href = "4-trm.html#SP5" > § 5. Copying< / a > < / li > < li > < a href = "4-trm.html#SP6" > § 6. Variable letters< / a > < / li > < li > < a href = "4-trm.html#SP8" > § 8. Underlying terms< / a > < / li > < li > < a href = "4-trm.html#SP9" > § 9. Adjective-noun conversions< / a > < / li > < li > < a href = "4-trm.html#SP11" > § 11. Writing to text< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. About terms. < / b > A "term" can be a constant, a variable, or a function of another term: see
< a href = "P-wtmd.html" class = "internal" > What This Module Does< / a > . Our data structure therefore falls into three
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cases. At all times exactly one of the three relevant fields, < span class = "extract" > < span class = "extract-syntax" > variable< / span > < / span > ,
< span class = "extract" > < span class = "extract-syntax" > constant< / span > < / span > and < span class = "extract" > < span class = "extract-syntax" > function< / span > < / span > is used.
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< / p >
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< ul class = "items" > < li > (a) Variables are represented by the numbers 0 to 25, and < span class = "extract" > < span class = "extract-syntax" > -1< / span > < / span > means
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"not a variable".
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< / li > < li > (b) Constants are pointers to < span class = "extract" > < span class = "extract-syntax" > specification< / span > < / span > structures of main
type < span class = "extract" > < span class = "extract-syntax" > VALUE< / span > < / span > , and < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > means "not a constant".
< / li > < li > (c) Functions are pointers to < span class = "extract" > < span class = "extract-syntax" > pcalc_func< / span > < / span > structures (see below), and
< span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > means "not a function".
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< / li > < / ul >
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< p class = "commentary" > Cinders are discussed in < a href = "../imperative-module/4-cad.html" class = "internal" > Cinders and Deferrals (in imperative)< / a > , and can be ignored for now.
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< / p >
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< p class = "commentary" > In order to verify that a proposition makes sense and does not mix up
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incompatible kinds of value, we will need to type-check it, and one part
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of that involves assigning a kind of value \(K\) to every term \(t\) occurring
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in the proposition. This calculation does involve some work, so we cache
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the result in the < span class = "extract" > < span class = "extract-syntax" > term_checked_as_kind< / span > < / span > field.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > variable< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > 0 to 25, or < / span > < span class = "extract" > < span class = "extract-syntax" > -1< / span > < / span > < span class = "comment-syntax" > for "not a variable"< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > or < / span > < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > < span class = "comment-syntax" > for "not a constant"< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_func< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > or < / span > < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > < span class = "comment-syntax" > for "not a function of another term"< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > cinder< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > complicated, this: used to worry about scope of I6 local variables< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > term_checked_as_kind< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > or < / span > < span class = "extract" > < span class = "extract-syntax" > NULL< / span > < / span > < span class = "comment-syntax" > if unchecked< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > The structure pcalc_term is accessed in 4/ap, 4/prp, 4/bas, 4/tcp, 5/sc, 5/smp and here.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > The < span class = "extract" > < span class = "extract-syntax" > pcalc_func< / span > < / span > structure represents a usage of a function inside a term.
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Terms such as \(f_A(f_B(f_C(x)))\) often occur, an example which would be stored
as:
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< / p >
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< ul class = "items" > < li > (1) A < span class = "extract" > < span class = "extract-syntax" > pcalc_term< / span > < / span > structure which has a < span class = "extract" > < span class = "extract-syntax" > function< / span > < / span > field pointing to
< / li > < li > (2) A < span class = "extract" > < span class = "extract-syntax" > pcalc_func< / span > < / span > structure whose < span class = "extract" > < span class = "extract-syntax" > bp< / span > < / span > field points to A, and whose < span class = "extract" > < span class = "extract-syntax" > fn_of< / span > < / span >
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field is
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< / li > < li > (3) A < span class = "extract" > < span class = "extract-syntax" > pcalc_term< / span > < / span > structure which has a < span class = "extract" > < span class = "extract-syntax" > function< / span > < / span > field pointing to
< / li > < li > (4) A < span class = "extract" > < span class = "extract-syntax" > pcalc_func< / span > < / span > structure whose < span class = "extract" > < span class = "extract-syntax" > bp< / span > < / span > field points to B, and whose < span class = "extract" > < span class = "extract-syntax" > fn_of< / span > < / span >
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field is
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< / li > < li > (5) A < span class = "extract" > < span class = "extract-syntax" > pcalc_term< / span > < / span > structure which has a < span class = "extract" > < span class = "extract-syntax" > function< / span > < / span > field pointing to
< / li > < li > (6) A < span class = "extract" > < span class = "extract-syntax" > pcalc_func< / span > < / span > structure whose < span class = "extract" > < span class = "extract-syntax" > bp< / span > < / span > field points to C, and whose < span class = "extract" > < span class = "extract-syntax" > fn_of< / span > < / span >
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field is
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< / li > < li > (7) A < span class = "extract" > < span class = "extract-syntax" > pcalc_term< / span > < / span > structure which has a < span class = "extract" > < span class = "extract-syntax" > variable< / span > < / span > field set to 0 (which is \(x\)).
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< / li > < / ul >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_func< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > the predicate B< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > from_term< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > which term of the predicate this derives from< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fn_of< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > the term to which we apply the function< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > pcalc_func< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > The structure pcalc_func is accessed in 4/bas, 4/tcp, 5/smp and here.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > Terms are really quite simple, as the following < a href = "../calculus-test/index.html" class = "internal" > calculus-test< / a > exercise shows:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > new binary sees (none, sees-f1)< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > ok< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > new binary knows (knows-f0, none)< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > ok< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > term 7< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > '7'< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > term z< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > z< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > term sees-f1 (7)< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > < sees-f1(*1) : '7'> < / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > term knows-f0 (sees-f1 (x))< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > < knows-f0(*1) : < sees-f1(*1) : x> > < / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > constant underlying 7< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > '7'< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > constant underlying y< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > --< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > constant underlying sees-f1 (7)< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > '7'< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > variable underlying 7< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > --< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > variable underlying y< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > y< / span >
< span class = "plain-syntax" > '< / span > < span class = "element-syntax" > variable underlying knows-f0 (sees-f1 (x))< / span > < span class = "plain-syntax" > ':< / span > < span class = "string-syntax" > x< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. Creating new terms. < / b > < / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::new_variable< / span > < button class = "popup" onclick = "togglePopup('usagePopup1')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup1" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::new_variable< / span > < / span > :< br / > < a href = "4-trm.html#SP9" > § 9< / a > < br / > Compilation Schemas - < a href = "3-cs.html#SP4" > § 4< / a > < br / > Atomic Propositions - < a href = "4-ap.html#SP6" > § 6< / a > , < a href = "4-ap.html#SP11" > § 11< / a > < br / > Propositions - < a href = "4-prp.html#SP28" > § 28< / a > , < a href = "4-prp.html#SP29" > § 29< / a > < br / > Sentence Conversions - < a href = "5-sc.html#SP3_3" > § 3.3< / a > , < a href = "5-sc.html#SP3_7" > § 3.7< / a > < br / > Simplifications - < a href = "5-smp.html#SP2_2" > § 2.2< / a > , < a href = "5-smp.html#SP3" > § 3< / a > , < a href = "5-smp.html#SP7" > § 7< / a > , < a href = "5-smp.html#SP9_3_2" > § 9.3.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > v< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "4-trm.html#SP4_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Make new blank term structure pt< / span > < span class = "named-paragraph-number" > 4.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > v< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) || (< / span > < span class = "identifier-syntax" > v< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 26< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "bad variable term created"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > variable< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > v< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::new_constant< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::new_constant< / span > < / span > :< br / > < a href = "4-trm.html#SP9" > § 9< / a > < br / > Atomic Propositions - < a href = "4-ap.html#SP11" > § 11< / a > < br / > Propositions - < a href = "4-prp.html#SP29" > § 29< / a > < br / > Binding and Substitution - < a href = "4-bas.html#SP15" > § 15< / a > < br / > Sentence Conversions - < a href = "5-sc.html#SP2" > § 2< / a > , < a href = "5-sc.html#SP3_3" > § 3.3< / a > , < a href = "5-sc.html#SP3_5" > § 3.5< / a > < br / > Simplifications - < a href = "5-smp.html#SP3" > § 3< / a > , < a href = "5-smp.html#SP14" > § 14< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "4-trm.html#SP4_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Make new blank term structure pt< / span > < span class = "named-paragraph-number" > 4.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::new_function< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::new_function< / span > < / span > :< br / > < a href = "4-trm.html#SP5" > § 5< / a > < br / > Simplifications - < a href = "5-smp.html#SP12" > § 12< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ptof< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) || (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > MAX_ATOM_ARITY< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "term out of range"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ; < / span > < span class = "named-paragraph-container code-font" > < a href = "4-trm.html#SP4_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Make new blank term structure pt< / span > < span class = "named-paragraph-number" > 4.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_func< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pf< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > pcalc_func< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > bp< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > pf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_of< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ptof< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > pf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > from_term< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pf< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP4_1" class = "paragraph-anchor" > < / a > < b > § 4.1. < / b > Where, in all three cases:
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Make new blank term structure pt< / span > < span class = "named-paragraph-number" > 4.1< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > variable< / span > < span class = "plain-syntax" > = -1;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > cinder< / span > < span class = "plain-syntax" > = -1; < / span > < span class = "comment-syntax" > that is, no cinder< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > term_checked_as_kind< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "4-trm.html#SP4" > § 4< / a > (three times).< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. Copying. < / b > < / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::copy< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::copy< / span > < / span > :< br / > Propositions - < a href = "4-prp.html#SP13" > § 13< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::duplicate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > = < / span > < a href = "4-trm.html#SP4" class = "function-link" > < span class = "function-syntax" > Terms::new_function< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > bp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP5" class = "function-link" > < span class = "function-syntax" > Terms::copy< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > fn_of< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > from_term< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. Variable letters. < / b > The number 26 turns up quite often in this chapter, and while it's normally
good style to define named constants, here we're not going to. 26 is a number
which anyone< sup id = "fnref:1" > < a href = "#fn:1" rel = "footnote" > 1< / a > < / sup > will immediately associate with the size of the alphabet.
Moreover, we can't really raise the total, because we will want to compile
these with single-character identifier names, < span class = "extract" > < span class = "extract-syntax" > a< / span > < / span > to < span class = "extract" > < span class = "extract-syntax" > z< / span > < / span > .< sup id = "fnref:2" > < a href = "#fn:2" rel = "footnote" > 2< / a > < / sup > To have a
variable limit lower than 26 would be artificial, since there are no memory
constraints arguing for it; but a proposition with 27 or more variables would
be too huge to evaluate at run-time in any remotely plausible length of time.
So although the 26-variables-only limit is embedded in Inform, it really is
not any restriction, and it greatly simplifies the code.
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< / p >
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< ul class = "footnotetexts" > < li class = "footnote" id = "fn:1" > < p class = "inwebfootnote" > < sup id = "fnref:1" > < a href = "#fn:1" rel = "footnote" > 1< / a > < / sup > Well, perhaps not a string theorist. "There aren't enough small numbers to
meet the many demands made of them" (Richard Guy).
< a href = "#fnref:1" title = "return to text" > ↩ < / a > < / p > < / li > < li class = "footnote" id = "fn:2" > < p class = "inwebfootnote" > < sup id = "fnref:2" > < a href = "#fn:2" rel = "footnote" > 2< / a > < / sup > Strictly speaking there is also < span class = "extract" > < span class = "extract-syntax" > _< / span > < / span > , but we won't go there.
< a href = "#fnref:2" title = "return to text" > ↩ < / a > < / p > < / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. < / b > The variables 0 to 25 are referred to by the letters \(x, y, z, a, b, c, ..., w\),
as provided for by this lookup array:
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pcalc_vars< / span > < span class = "plain-syntax" > = < / span > < span class = "string-syntax" > "xyzabcdefghijklmnopqrstuvw"< / span > < span class = "plain-syntax" > ;< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP8" class = "paragraph-anchor" > < / a > < b > § 8. Underlying terms. < / b > Routines to see if a term is a constant \(C\), or if it is a chain of functions
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at the bottom of which is a constant \(C\); and similarly for variables.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Terms::constant_underlying< / span > < button class = "popup" onclick = "togglePopup('usagePopup5')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup5" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::constant_underlying< / span > < / span > :< br / > Type Check Propositions - < a href = "4-tcp.html#SP4_1" > § 4.1< / a > < br / > Simplifications - < a href = "5-smp.html#SP2" > § 2< / a > , < a href = "5-smp.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "null term"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP8" class = "function-link" > < span class = "function-syntax" > Terms::constant_underlying< / span > < / a > < span class = "plain-syntax" > (& (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_of< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::variable_underlying< / span > < button class = "popup" onclick = "togglePopup('usagePopup6')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup6" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::variable_underlying< / span > < / span > :< br / > Propositions - < a href = "4-prp.html#SP25" > § 25< / a > , < a href = "4-prp.html#SP27" > § 27< / a > < br / > Binding and Substitution - < a href = "4-bas.html#SP1" > § 1< / a > , < a href = "4-bas.html#SP7" > § 7< / a > , < a href = "4-bas.html#SP13_1" > § 13.1< / a > < br / > Sentence Conversions - < a href = "5-sc.html#SP3_2" > § 3.2< / a > < br / > Simplifications - < a href = "5-smp.html#SP13" > § 13< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "null term"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > variable< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > variable< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP8" class = "function-link" > < span class = "function-syntax" > Terms::variable_underlying< / span > < / a > < span class = "plain-syntax" > (& (< / span > < span class = "identifier-syntax" > t< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_of< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > -1;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP9" class = "paragraph-anchor" > < / a > < b > § 9. Adjective-noun conversions. < / b > As we shall see, a general unary predicate stores a type-reference
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pointer to an adjectival phrase — the adjective it tests. But
sometimes the same word acts both as adjective and noun in English. In
"the green door", clearly "green" is an adjective; in "the door
is green", it is possibly a noun; in "the colour of the door is
green", it must surely be a noun. Yet these are all really the same
meaning. To cope with this ambiguity, we need a way to convert the
adjectival form of such an adjective into its noun form, and back
again.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifdef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CORE_MODULE< / span >
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< span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::adj_to_noun_conversion< / span > < button class = "popup" onclick = "togglePopup('usagePopup7')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup7" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::adj_to_noun_conversion< / span > < / span > :< br / > Propositions - < a href = "4-prp.html#SP29" > § 29< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > unary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tr< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > adjective< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > aph< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > AdjectivalPredicates::to_adjective< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > tr< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > AdjectiveAmbiguity::has_enumerative_meaning< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > aph< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP4" class = "function-link" > < span class = "function-syntax" > Terms::new_constant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Rvalues::from_instance< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > property< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > AdjectiveAmbiguity::has_either_or_property_meaning< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > aph< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP4" class = "function-link" > < span class = "function-syntax" > Terms::new_constant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Rvalues::from_property< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > prn< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP4" class = "function-link" > < span class = "function-syntax" > Terms::new_variable< / span > < / a > < span class = "plain-syntax" > (0);< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP10" class = "paragraph-anchor" > < / a > < b > § 10. < / b > And conversely:
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > unary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Terms::noun_to_adj_conversion< / span > < button class = "popup" onclick = "togglePopup('usagePopup8')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup8" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::noun_to_adj_conversion< / span > < / span > :< br / > Type Check Propositions - < a href = "4-tcp.html#SP4_6" > § 4.6< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifdef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CORE_MODULE< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Node::is< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > CONSTANT_NT< / span > < span class = "plain-syntax" > ) == < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::get_kind_of_value< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Properties::property_with_same_name_as< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > ) == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Kinds::Behaviour::is_an_enumeration< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::get_constant_instance< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > AdjectivalPredicates::new_up< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Instances::as_adjective< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP11" class = "paragraph-anchor" > < / a > < b > § 11. Writing to text. < / b > The art of this is to be unobtrusive; when a proposition is being logged,
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we don't much care about the constant terms, and want to display them
concisely and without fuss.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::log< / span > < button class = "popup" onclick = "togglePopup('usagePopup9')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup9" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::log< / span > < / span > :< br / > Calculus Module - < a href = "1-cm.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "4-trm.html#SP11" class = "function-link" > < span class = "function-syntax" > Terms::write< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > DL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Terms::write< / span > < button class = "popup" onclick = "togglePopup('usagePopup10')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup10" > Usage of < span class = "code-font" > < span class = "function-syntax" > Terms::write< / span > < / span > :< br / > Calculus Module - < a href = "1-cm.html#SP5" > § 5< / a > < br / > Compilation Schemas - < a href = "3-cs.html#SP7" > § 7< / a > < br / > Atomic Propositions - < a href = "4-ap.html#SP14_1" > § 14.1< / a > , < a href = "4-ap.html#SP14_4" > § 14.4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "< null-term> "< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > constant< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > cinder< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "const_%d"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > cinder< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Wordings::nonempty< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Node::get_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > ))) { < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "'%W'"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > Node::get_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > )); < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifdef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CORE_MODULE< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Node::is< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > CONSTANT_NT< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > instance< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Rvalues::to_object_instance< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > Instances::write< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ; }< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Node::log_node< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > C< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > binary_predicate< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > bp< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > i6_schema< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fn< / span > < span class = "plain-syntax" > = < / span > < a href = "3-bp.html#SP7" class = "function-link" > < span class = "function-syntax" > BinaryPredicates::get_term_as_fn_of_other< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bp< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > -< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > from_term< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "function of non-functional predicate"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-cs.html#SP7" class = "function-link" > < span class = "function-syntax" > Calculus::Schemas::write_applied< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > fn< / span > < span class = "plain-syntax" > , & (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_of< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > variable< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > variable< / span > < span class = "plain-syntax" > ;< / span >
2020-08-07 12:39:22 +03:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > < 26) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%c"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pcalc_vars< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ]); < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "< bad-var=%d> "< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "< bad-term> "< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "3-cs.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-cm.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-up.html" > 2< / a > < / li > < li class = "progresschapter" > < a href = "3-bpf.html" > 3< / a > < / li > < li class = "progresscurrentchapter" > 4< / li > < li class = "progresscurrent" > trm< / li > < li class = "progresssection" > < a href = "4-ap.html" > ap< / a > < / li > < li class = "progresssection" > < a href = "4-prp.html" > prp< / a > < / li > < li class = "progresssection" > < a href = "4-bas.html" > bas< / a > < / li > < li class = "progresssection" > < a href = "4-tcp.html" > tcp< / a > < / li > < li class = "progresschapter" > < a href = "5-sc.html" > 5< / a > < / li > < li class = "progressnext" > < a href = "4-ap.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >