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relates a term and one of its arguments.
arg(+N, +CompoundTerm, -Argument)
arg/3 unifies Argument with the N-th argument of CompoundTerm.
Arguments
N integer (between 1 and the arity of CompoundTerm) CompoundTerm compound term Argument term
Examples
| arg(1, f(a,b,c), X). | Succeeds with substitution X <- a. |
| arg(2, f(X, g((a,h(a,b))), g(a,Z)). | Succeeds with substitution Z <- h(a,b) |
| arg(3,f(a,b),X). | Fails. |
Standard
This predicate is part of the ISO-Prolog Standard.
See also
copy_term/2, functor/3, '=..'/2.
| document: http://www.ifcomputer.co.jp/MINERVA/Manual/Reference/Predicates/term_creat_decomp/arg/print_en.html published 2012/2/6 update 1998/8/11 (c) 1996-2009 IF Computer Japan | ||||||||
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