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C++ Program to Convert Octal to Binary

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In this tutorial, we will write a program to convert an octal number into binary in C++. 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 Octal to Binary Conversion in C++.

C++ Program to Convert Octal to Binary

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

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

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

   i = 1;

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

   return binNumber;
}

//Main function
int main()
{
   int octNumber, result;

   cout << "Enter an octal number: ";
   cin >> octNumber;

   result = conversionFunc(octNumber);
   cout << "Equivalent Binary Number: " << result;

   return 0;
}

Output:

Enter an octal number: 64
Equivalent Binary Number: 110100

You may go through the vice versa conversion:

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