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  1. countdown(X) :- number(X), X < 0.
  2. countdown(X) :- number(X), X >= 0,write(X), nl, NX is X - 1, countdown(NX).
Success #stdin #stdout 0.02s 68352KB
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GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
https://ideone.com/NEnGQ
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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