====== Functor predicate ======
{{tag>misc}}
===== Description =====
Usage of predicate "functor"

**Source**:  PROLOG str. 48 Wydawnictwo PLJ Warszawa 1991 ISBN 83-85190-63-5
===== Download =====
Program source code: {{functor_predicate.pl}}
===== Listing =====
<code prolog>
test1 :- functor([a, b, c, d], F, N).
test2 :- functor(fakt, F, N).
test3 :- functor(X, osoba, 3).
test4 :- functor(1 + 5, F, N).</code>
===== Comments =====