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  1. factorial(0,1).
  2.  
  3. factorial(A,B) :-  
  4.            A > 0, 
  5.            C is A-1,
  6.            factorial(C,D),
  7.            B is A*D.
Success #stdin #stdout 0.02s 68352KB
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?- factorial(10,What).
stdout
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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:4) . or operator expected after expression'),read_term/3)
https://ideone.com/nRkpi
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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