问题标题: 1324 对应输出2 哪里出错了（80分）大神求解！！

#include<iostream>
using namespace std;
int main()
{
    int a;
    cin>>a;
    switch(a)
   {
    case 1:cout<<"f=n";break; 
    case 2:cout<<"f=n*n";break; 
    case 3:cout<<"f=n*n*n";break; 
    case 4:cout<<"f=n*n*n*n";break; 
    case 5:cout<<"f=n*n*n*n*n";break; 
    case 6:cout<<"f=n*n*n*n*n*n";break; 
    case 7:cout<<"f=n*n*n*n*n*n*n";break; 
    case 8:cout<<"f=n*n*n*n*n*n*n*n";break; 
    default:cout<<"Error";break; 
   }
    return 0;
}http://judge.codingtang.com/problem/1324/