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  1. #include <stdio.h>
  2.  
  3. int factorial(int n);
  4.  
  5. int comb(int m,int k);
  6.  
  7. int main(void) {
  8. int m,k,result;
  9. scanf("%d%d",&m,&k);
  10. result=comb(m,k);
  11. printf("%d個の中から%d個を取り出す組合せ数は、%d通りです",m,k,result);
  12. 	return 0;
  13. }
  14.  
  15. int factorial(int n){
  16. int i,answer=1;
  17. for(i=n;i>1;i--){
  18. 	answer*=i;
  19. }
  20.  
  21. return answer;
  22. 	}
  23.  
  24. int comb(int m,int k){
  25. 	int result;
  26. result=factorial(m)/(factorial(k)*factorial(m-k));
  27. return result;
  28. 	}
  29.  
  30.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
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12 6
stdout
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12個の中から6個を取り出す組合せ数は、924通りです
https://ideone.com/pcmS7s
language:
C (gcc 8.3)
created:
134 days ago
visibility:
public

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