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is_odd(X) :- 1 is mod(X,2).
is_even(X) :- 0 is mod(X,2).

Success #stdin #stdout 0.02s 68352KB

stdin

X=3.
is_odd(X).

stdout

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:

visibility:

public

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