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Java Program to Convert Decimal Number to Octal Number

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

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.

Conversion example:

Input: 19
Output: 23

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

Java Program to Convert Decimal to Octal using while loop

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    int decNum, octalNumber = 0, i = 1;
    Scanner scan = new Scanner(System.in);

    System.out.print("Enter a Decimal Number: ");
    decNum = scan.nextInt();

    while (decNum != 0)
    {
      octalNumber += (decNum % 8) *i;
      decNum /= 8;
      i *= 10;
    }

    System.out.printf("Equivalent Octal value: %d", octalNumber);
  }
}

Output:

Enter a Decimal Number: 19
Equivalent Octal value: 23

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