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  1. main:-
  2. 	fact(4,F),
  3. 	halt.
  4.  
  5. fact(0, 1).
  6. fact(N, F) :-
  7.     N > 0,                    /* N > 0 をチェック */
  8.     N1 is N-1,                /* N-1 を N1 に求める */
  9.     fact(N1, F1),             /* N1! を F1 に求める */
  10.     F is N*F1.                /* F は N*F1 とする */
  11.  
Success #stdin #stdout #stderr 0.02s 6876KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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Warning: /home/WY0gXO/prog:1:
	Singleton variables: [F]
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/dMatLT
language:
Prolog (swi 7.6.4)
created:
11 days ago
visibility:
public

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