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  1. countdown(X) :-
  2. 	number(X),
  3. 	X < 0.
  4. countdown(X) :-
  5. 	number(X),
  6. 	X>=0,
  7. 	write(X), nl,
  8. 	NX is X-1,
  9. 	countdown(NX).
Success #stdin #stdout 0.03s 6204KB
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stdin
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?- countdown(4).
stdout
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Standard output is empty
https://ideone.com/nJBhQ
language:
Prolog (swi 7.6.4)
created:
14 years ago
visibility:
public

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