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  1. even(0).
  2. even(s(s(X))):-even(X).
  3.  
  4. odd(s(0)).
  5. odd(s(s(X))):-odd(X).
Success #stdin #stdout 0.02s 68352KB
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odd(2)
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GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:1 (char:7) . or operator expected after expression'),read_term/3)
https://ideone.com/8maVv
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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