1022. D进制的A+B (20)

#include <iostream>
#include <iomanip>
#include <math.h>
#include <stdio.h>
#include <string>

using namespace std;

int main()
{
    long a, b, sum;
    int n;
    cin >> a >> b >> n;
    sum = a + b;
    int cnt = 0;
    int arry[31];
    do{
        arry[cnt++] = sum%n;
        sum /= n;
    } while (sum);
    for (int i = cnt - 1; i >= 0; i--)
    {
        cout << arry[i];
    }


    system("pause");
    return 0;
}