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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*Mfac.
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/6IBE5
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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