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  1. odd(X):- 1 is mod(X,2).
  2. even(X):- 0 is mod(X,2).
Success #stdin #stdout 0.02s 68352KB
stdin
odd(3).
even(3).
odd(4).
even(4).
stdout
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz

yes

no

no

yes