A Program to convert Binary to Decimal

num_convert.cpp

#include <iostream>
#include <math.h>

int main()
{
    long long num, dec = 0, raised = 0, rem;

    std::cin >> num;

    while (num != 0)
    {
        rem = num % 10;
        num /= 10;
        dec += rem * std::pow(2, raised);
        raised++;
    }

    std::cout << "Decimal is: " << dec << std::endl;
    return 0;
}