By | 25.12.2016

# Decimal Number to Octal

Write a C++ Program to Convert Decimal Number to Octal. Here’s simple C++ Program to Convert Decimal 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 Decimal 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.

### SOURCE CODE : :

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

#include <iostream>
#include <cmath>
using namespace std;

int decimalToOctal(int decimalNumber);

int main()
{
int decimalNumber;
cout << "Enter a decimal number :: ";
cin >> decimalNumber;
cout <<"\n [ "<< decimalNumber << " ] in decimal = [ " << decimalToOctal(decimalNumber) << " ] in octal\n";
return 0;
}

// Function to convert decimal number to octal
int decimalToOctal(int decimalNumber)
{
int rem, i = 1, octalNumber = 0;
while (decimalNumber != 0)
{
rem = decimalNumber % 8;
decimalNumber /= 8;
octalNumber += rem * i;
i *= 10;
}
return octalNumber;
}```

### OUTPUT : :

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

Enter a decimal number :: 123

[ 123 ] in decimal = [ 173 ] in octal

Process returned 0```

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

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