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# Program to convert Binary to Octal Number

0 Suresh Chand April 4, 2021

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

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

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

The output of above program is

``````Enter a binary number: 110
110 in binary = 6 in octal ``````

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

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