How to convert Decimal to Octal in C++

CPlusPlus-TypeConversion

In this article, we are going to learn how to convert Decimal to Octal in C++. Here we are going to learn about two number systems one is octal and another is Decimal. Octal numbers are based on 8 numbers and are represented in numbers from 0 to 7. Decimal numbers are base 10 numbers and are represented in numbers from 0 to 9.

C++ Program to convert Decimal to Octal

We will write the below program to convert Decimal to octal with any built-in function.

#include<iostream>

using namespace std;

int main()
{
    long long decimalNum, tmpDecimalNo;
    long long octalNum;
    int i, rem, place = 1;

    octalNum = 0;

    cout << "Please enter the decimal number: ";
    cin >> decimalNum;

    tmpDecimalNo = decimalNum;

    while(tmpDecimalNo > 0)
    {
        rem = tmpDecimalNo % 8;

        octalNum = (rem * place) + octalNum;

        tmpDecimalNo = tmpDecimalNo/8;

        place *= 10;
    }
 
    cout << "\nThe Octal equivalent of Decimal number " << decimalNum << " is " << octalNum;  

    return 0;
}

Output

Please enter the decimal number: 25

The Octal equivalent of Decimal number 25 is 31

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