第12周实验报告求阶乘2-1

#include<iostream>using namespace std;long fac(int n)//求 N的阶乘{int jc = 1;while ( n > 0 ){jc = jc * n;n--;}return jc;}int main(){int m,n,c;cout << "请输入m,n的值" << endl;cin >> m >> n;    c = fac(m)/( fac(n)*( fac(m-n) ) );cout << "所求组合数为" << c << endl;return 0;}