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  1. factorial(0,1):- !.
  2. factorial(X, Y):- 
  3. 	Y is X*Y,
  4. 	factorial(X-1, Y),
  5. 	write(Y).
Success #stdin #stdout 0.02s 68352KB
comments (?)
stdin 
factorial(5,X).
stdout 
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(instantiation_error,(is)/2)
https://ideone.com/V1tBP
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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