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  1. #include <stdio.h>
  2. int kaijo (int x){
  3.     if(x==1 || x==0){
  4.         return x;
  5.     }else{
  6.         x=x*kaijo(x-1);
  7.         return x;
  8.     }
  9. }
  10. int bunshi(int n, int r){
  11.     if(r==0){
  12.         return 1;
  13.     }else if(r==1){
  14.         return n;
  15.     }else{
  16.         n=n*bunshi(n-1,r-1);
  17.         return n;
  18.     }
  19. }
  20. int main(){
  21.     printf("%d",bunshi(5,2)/kaijo(2));
  22.     printf("%d",bunshi(6,3)/kaijo(3));
  23.     printf("%d",bunshi(7,4)/kaijo(4));
  24.     return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5324KB
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102035
https://ideone.com/fc9Jxe
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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