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# Program to convert Octal to Binary Number

0 Suresh Chand March 28, 2021

In this example, We will learn how to convert octal number to binary number.

To understand this example, You must have knowledge in following topics

``````#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;
}``````

The output of above program is

``````Enter an octal number: 5
5 in octal = 101 in binary``````

In the above example, We have created one function convertOctalToBinary() which converts the octal number to the binary number.

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