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  1. even(N):-
  2. A is mod(N,2),
  3. A = 0.
  4. odd(N):-
  5. A is mod(N,2),
  6. A = 1.
Success #stdin #stdout 0.01s 68352KB
stdin
9
stdout
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:1 (char:2) . or operator expected after expression'),read_term/3)