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  1. factoriel(0,1).
  2.      factoriel(X,Y) :-
  3.                       X1 is X - 1,
  4.                       factoriel(X1,Z),
  5.                       Y is Z*X,!.
Success #stdin #stdout 0.02s 68352KB
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?-fac(5,X)
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GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:1 (char:3) . or operator expected after expression'),read_term/3)
https://ideone.com/MUvR6
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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