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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
comments (?)
stdin 
X=3
?-is_odd(X).
stdout 
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:2 (char:1) . or operator expected after expression'),read_term/3)
https://ideone.com/P7mPV
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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