十进制转m进制

#include<iostream>
#include<stack>
using namespace std;
int main()
{
    int n, m;
    while(cin >> n >> m)
    {
        stack<int> a;
        do
        {
           a.push(n % m);
           n = n / m;
        }while(n);
        while(!a.empty())
        {
            if(a.top() >= 10)
              cout << char(a.top() - 10 + ‘A‘);
            else
              cout << a.top();
            a.pop(); 
        }
        cout << endl;
    }
}