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  1. #include<stdio.h>
  2. int factorial(int n){
  3. 	int i,result;
  4. 	result=1;
  5. 	for(i=n;i>=1;i--){
  6. 		result=result*i;
  7. 	}
  8. 	return result;
  9. }
  10.  
  11. int comb(int m,int k){
  12. 	int a;
  13. 	a=factorial(m)/(factorial(k)*factorial(m-k));
  14. 	return a;
  15. }
  16.  
  17. int main(){
  18. 	int m,k;
  19. 	scanf("%d",&m);
  20. 	scanf("%d",&k);
  21. 	printf("%d個の中から%d個を取り出す組み合わせ数は、%d通りです。",m,k,comb(m,k));
  22.  
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5284KB
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10
3
stdout
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10個の中から3個を取り出す組み合わせ数は、120通りです。
https://ideone.com/wlh5Ik
language:
C (gcc 8.3)
created:
134 days ago
visibility:
public

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