cfb35_binary_to_octal.cpp

#include<iostream>
#include<cmath>

using namespace std;

int convertBinaryToOctal(long long);
int main(){
    long long binaryNumber;
    cout << "Enter a binary number: ";
    cin >> binaryNumber;
    cout << binaryNumber << " in binary = " << convertBinaryToOctal(binaryNumber) << " in octal ";
    return 0;

}

int convertBinaryToOctal(long long binaryNumber){
    int octalNumber = 0, decimalNumber = 0, i = 0;
    while(binaryNumber != 0){
        decimalNumber += (binaryNumber%10)*pow(2, i);
        ++i;
        binaryNumber /= 10;
    }
    i = 1;
    while(decimalNumber != 0){
        octalNumber += (decimalNumber % 8) * i;
        decimalNumber /= 8;
        i *= 10;
    }
    return octalNumber;
}