test

#include <iostream>
using namespace std;

void main( )
{
    int n,i=1,f=1;
    char a;
    do
    {
    cout<<"请输入一个整数：";
    cin>>n;

    while (f<=n)
        {
        i=f*i;
        f++;
        }
    cout<<"n="<<n<<",n!="<<i<<endl;
    i=1;
    f=1;
    cout<<"还要算别的吗？【Y/N】";
    cin>>a;
    }
    while( a==‘y‘ || a==‘Y‘);
}