convert_octal_to_binary.cpp

#include <iostream>
#include <cmath>
using namespace std;
long long convertOctalToBinary(int);
int main()
{
    int octalNumber;
    cout << "Enter an octal number: ";
    cin >> octalNumber;
    cout << octalNumber << " in octal = " << convertOctalToBinary(octalNumber) << "in binary";
    return 0;
}
long long convertOctalToBinary(int octalNumber)
{
    int decimalNumber = 0, i = 0;
    long long binaryNumber = 0;
    while(octalNumber != 0)
    {
        decimalNumber += (octalNumber%10) * pow(8,i);
        ++i;
        octalNumber/=10;
    }
    i = 1;
    while (decimalNumber != 0)
    {
        binaryNumber += (decimalNumber % 2) * i;
        decimalNumber /= 2;
        i *= 10;
    }
    return binaryNumber;
}