C++ Program to Convert Decimal to Octal Number

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CPlusPlus Programs

In this tutorial, we will write a program to convert decimal to octal in C++. Before that, you must have knowledge of the following topics in C++.

C++ operator
C++ while loop

Octal number

The octal numbers are the numbers with base 8 and use the digits 0 to 7. Example: 8 in decimal is represented as 10 in octal, 25 as 31, and so on.

Decimal Number

These are the numbers with a base of 10, which ranges from 0 to 9. These numbers are formed with the combination of 0 to 9 digits such as 24, 345, etc.

Let us go through a program for the Decimal to Octal Conversion in C++.

C++ Program to Convert Decimal to Octal Number

The program takes a user input for a decimal number. And then iterate using a while loop. You can also use for loop instead of while loop, the code remains the same. Lastly, display the equivalent octal value.

#include <iostream>
using namespace std;

int main()
{
   int deci, oct[50], i = 0;

   cout << "Enter a Decimal number: ";
   cin >> deci;

   // calculation
   while (deci != 0)
   {
      oct[i] = deci % 8;
      i++;
      deci = deci / 8;
   }

   //Display the result
   cout << "Octal Value: ";
   for (i = (i - 1); i >= 0; i--)
      cout << oct[i];

   return 0;
}

Output:

Enter a Decimal number: 8 Octal Value: 10

You may go through the following program for vice-versa:

C++ Convert Octal to Decimal

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