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  1. fac( 0, 1) :-!.
  2. fac( N, Nfac) :-
  3. N > 0.
  4. M is N - 1.
  5. fac( M, Mfac).
  6. Nfac is N*Nfac.
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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?- fac(5,X).
compilation info 
prog.pl:2-3: warning: singleton variables [Nfac] for fac/2
prog.pl:4: fatal error: redefining built-in predicate (is)/2
compilation failed
stdout
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Standard output is empty
https://ideone.com/ppTa8
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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