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  1. num(X).
  2. mod(X, 2) is 0.
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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?- num(10)
compilation info 
prog.pl:1: warning: singleton variables [X] for num/1
prog.pl:2: fatal error: redefining built-in predicate (is)/2
compilation failed
stdout
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Standard output is empty
https://ideone.com/cc1Ep
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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