C++ Program to Convert Binary Number to Octal

By | 25.12.2016

Convert Binary Number to Octal

Write a C++ Program to Convert Binary Number to Octal. Here’s simple C++ Program to Convert Binary Number to Octal 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 Binary Number to Octal. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.


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

#include <iostream>
#include <cmath>

using namespace std;

int convertBinarytoOctal(long long);
int main()
    long long binaryNumber;

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

     cout <<"\n [ "<< binaryNumber << " ] in binary = [ " << convertBinarytoOctal(binaryNumber) << " ] in octal \n";

    return 0;

int convertBinarytoOctal(long long binaryNumber)
    int octalNumber = 0, decimalNumber = 0, i = 0;

    while(binaryNumber != 0)
        decimalNumber += (binaryNumber%10) * pow(2,i);

    i = 1;

    while (decimalNumber != 0)
        octalNumber += (decimalNumber % 8) * i;
        decimalNumber /= 8;
        i *= 10;

    return octalNumber;


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

Enter a binary number: 100111

 [ 100111 ] in binary = [ 47 ] in octal

Process returned 0

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

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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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#include <iostream>
using namespace std;

int main(){

int bin, dig, b=1, decim=0, oct;

cout << Enter any binary number: ;
cin >> bin;

cout << \n[ << bin << ] in binary = ;

while(bin!=0){ // pass binary to decimal

oct = (decim/8)*10+decim%8; // pass decimal to octal

cout << [ << oct << ] in octal\n;