fork download
copy 
  1. factorial(0,1):- !.
  2. factorial(X, Y):- 
  3. 	X>0,
  4. 	X1 is X-1,
  5. 	factorial(X1, Z),
  6. 	Y is X*Z.
Success #stdin #stdout 0.02s 68352KB
comments (?)
stdin
copy 
factorial(5,X).
stdout
copy 
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz

X = 120

yes
https://ideone.com/dqtnn
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!