By | 25.12.2016

# Convert Octal Number to Binary

Write a C++ Program to Convert Octal Number to Binary. Here’s simple C++ Program to Convert Octal Number to Binary in C++ Programming Language.

## Numbers in C++

Normally, when we work with Numbers, we use primitive data types such as int, short, long, float and double, etc. The number data types, their possible values and number ranges have been explained while discussing C++ Data Types.

Here is source code of the C++ Program to Convert Octal Number to Binary. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

### SOURCE CODE : :

```/*  C++ Program to Convert Octal Number to Binary  */

#include <iostream>
#include <cmath>

using namespace std;

long long convertOctalToBinary(int);
int main()
{
int octalNumber;

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

cout <<"\n [ "<< octalNumber << " ] in octal = [ " << convertOctalToBinary(octalNumber) << " ] in binary\n";

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;
}```

### OUTPUT : :

```/*  C++ Program to Convert Octal to Binary  */

Enter an octal number: 454

[ 454 ] in octal = [ 100101100 ] in binary

Process returned 0```

Above is the source code for C++ Program to Convert Octal to Binary which is successfully compiled and run on Windows System.The Output of the program is shown above .

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