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

X = 3

yes
uncaught exception: error(syntax_error('user_input:2 (char:3) . or operator expected after expression'),read_term/3)
https://ideone.com/0JAms
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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