下学期第二周实验报告2

#include <iostream>

using namespace std;

long fac(int n)
{
for(int i = 1, sum = 1; i <= n; i++)
{
sum = sum * i;
}

return sum;
}

int main()
{
int C, m, n;
cout << "请输入m, n的值: ";
cin >> m >> n;
C = fac(m) /(fac(n) * fac(m - n));
cout << C << endl;

return 0;
}