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  1.  
  2. factorial(0, 1).
  3. factorial(N, F) :- N > 0, Prev is N -1, factorial(Prev, R), F is R * N.
  4.  
  5. :- factorial(5,X), writeln(X).
Success #stdin #stdout #stderr 0.02s 6204KB
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Standard input is empty
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120
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Prolog (swi 7.6.4)

					

					

						
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10 years ago

					

					

						
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