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

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• # 1:   hide show   clone   input   110 days 4 hours ago    Success

  result: Success     time: 0.02s    memory: 68352 kB     returned value: 0

  input:

  X=3
  ?-is_odd(X).

  output:

  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)