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  1. countdown(0,1).
  2.  
  3. countdown(N,F) :-  
  4.    N>0, 
  5.    N1 is N-1, 
  6.    countdown(N1,F1), 
  7.    F is F1.
  8.  
Success #stdin #stdout 0.03s 6204KB
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factorial(5,F).
stdout
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Standard output is empty
https://ideone.com/PeGgk
language:
Prolog (swi 7.6.4)
created:
14 years ago
visibility:
public

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