八进制十进制转换

#include <iostream>
#include<vector>
using namespace std;
int main()
{
    vector<int>a;
    int n;
    while (cin >> n) {
        if (n == 0)break;
        int sum = 0;
        int i = 0;
        while (n) {
            sum += (n % 10) * pow(8, i++);
            n /= 10;
        }
        a.push_back(sum);
    }
    for (int i = 0; i < a.size(); i++) {
        cout << a[i] << endl;
    }
}