P124 第47题 组合数

#include<stdio.h>int comm(int n,int k){if(n<k)return 0;else if(n==k||k==0)return 1;elsereturn comm(n-1,k)+comm(n-1,k-1);}int main(){int n,k;while(1){printf("put n&k");scanf("%d%d",&n,&k);printf("%d\n",comm(n,k));}return 0;}