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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:2-4: warning: singleton variables [Nfac,M] for fac/2
prog.pl:5-6: fatal error: redefining control construct (',')/2
compilation failed
stdout
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Standard output is empty
https://ideone.com/NaX7m
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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