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C++ Program to Convert Binary to Octal

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In this tutorial, we will write a C++ program to convert a binary number into octal using while loop. Before that, you must have knowledge of the following topics in C++.

Binary number

The binary numbers are based on 0 and 1, so it is a base 2 number. They are the combination of 0 and 1. For example, 1001, 110101, etc.

Octal number

The octal numbers are the numbers with base 8 and use the digits 0 to 7. Example: 8 in decimal is represented as 10 in octal, 25 as 31, and so on.

Let us go through a program for the Binary to Octal Conversion in C++.

C++ Program to Convert Binary to Octal

#include <iostream>
#include <cmath>
using namespace std;

//user defined function
int conversionFunc(int binNumber)
{
   int octNumber = 0, deciNum = 0, i = 0;

   while (binNumber != 0)
   {
      deciNum += (binNumber % 10) *pow(2, i);
      ++i;
      binNumber /= 10;
   }

   i = 1;

   while (deciNum != 0)
   {
      octNumber += (deciNum % 8) *i;
      deciNum /= 8;
      i *= 10;
   }

   return octNumber;
}

// MAIN Function
int main()
{
   int binNumber, result;

   cout << "Enter a binary number: ";
   cin >> binNumber;

   result = conversionFunc(binNumber);
   cout << "Equivalent Octal value: " << result;

   return 0;
}

Output:

Enter a binary number: 1101110
Equivalent Octal value: 156

You may go through the vice versa conversion:

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