Nhị sang thập

#include<iostream>
using namespace std;
int main()
{
    int num, bin_val, dec_val = 0, rem, base = 1;
    cout << "Hay nhap so nhi phan: ";
    cin >> num;
    bin_val = num;
    while (num > 0)
    {
        rem = num % 10;
        dec_val = dec_val + rem * base;
        num = num / 10;
        base = base * 2;
    }
    cout << "So nhi phan: " << bin_val << endl;
    cout << "Doi sang thap phan: " << dec_val << endl;
    return 0;
}