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  1. is_odd(X) :- 1 is mod(X,2).
  2. is_even(X) :- 0 is mod(X,2).
Success #stdin #stdout 0.02s 68352KB
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X=3.
is_odd(X).
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GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz

X = 3

yes
uncaught exception: error(instantiation_error,(is)/2)
https://ideone.com/g7F33
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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