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  1. even(s(s(x))) :- even(X).
Success #stdin #stdout 0.01s 68352KB
comments (?)
stdin 
?- even(2).
stdout 
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:1 (char:4) . or operator expected after expression'),read_term/3)
https://ideone.com/5xzY8
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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