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  1. #include <stdio.h>
  2.  
  3. int kaijo(int a,int b)
  4. 	{
  5. 		int i,x,y,z,kekka;
  6. 		x = 1;
  7. 		for(i=a;i>1;i--)
  8. 		{
  9. 			x = x*i;
  10. 		}
  11. 		y = 1;
  12. 		for(i=b;i>1;i--)
  13. 		{
  14. 			y = y*i;
  15. 		}
  16. 		z = 1;
  17. 		for(i=a-b;i>1;i--)
  18. 		{
  19. 			z = z*i;
  20. 		}
  21.  
  22. 		kekka = x / y*z;
  23. 		return kekka;
  24. 	}
  25.  
  26. int main(void){
  27. 	int comb(int m,int k)
  28. 	{
  29. 		int p,q;
  30. 		printf("mを入力してください:\n");
  31. 		scanf("%d",&p);
  32. 		printf("kを入力してください:\n");
  33. 		scanf("%d",&q);
  34. 		printf("%d個の中から%d個を取り出す組合せ数は%d通りです\n",p,q,kaijo(p,q));
  35.  
  36.  
  37. 	}
  38. }
  39.  
Success #stdin #stdout 0s 5288KB
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https://ideone.com/OgLGcS
language:
C (gcc 8.3)
created:
134 days ago
visibility:
public

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