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  1. % Factorial of 0 is 1.
  2. factorial(0, 1).
  3. % Recursive case: N! = N * (N-1)!
  4. factorial(N, Result) :-
  5.     N > 0,
  6.     N1 is N - 1,
  7.     factorial(N1, R1),
  8.     Result is N * R1.
  9.  
  10. % GCD using Euclidean algorithm
  11. gcd(X, 0, X) :- X > 0.
  12. gcd(X, Y, Result) :-
  13.     Y > 0,
  14.     Remainder is X mod Y,
  15.     gcd(Y, Remainder, Result).
Success #stdin #stdout #stderr 0.04s 6916KB
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ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/29y0Yn
language:
Prolog (swi 7.6.4)
created:
6 days ago
visibility:
public

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