Java Program to convert Decimal to Octal

In this article, we will understand how to convert decimal to octal. a Decimal number is a number whose whole number part and the fractional part is separated by a decimal point. Octal Number has a base of eight and uses the number from 0 to 7.

Below is a demonstration of the same −

Input

Suppose our input is −

Enter the decimal number : 8

Output

The desired output would be −

The octal value is
10

Algorithm

Step 1 - START
Step 2 - Declare three integer value namely my_input, I and j and an integer array my_octal
Step 3 - Read the required values from the user/ define the values
Step 4 – Using a while condition of input not equal to 0, compute my_input % 8 and store it
to my_octal[i]
Step 5 - Compute my_input / 8 and assign it to ‘my_input’, increment ‘i’ value.
Step 6 – Iterating using a for loop, print the ‘my_octal’ array
Step 7- Stop

Example 1

Here, the input is being entered by the user based on a prompt. You can try this example live in ourcoding ground tool .

import java.util.Scanner;
public class DecimalToOctal {
   public static void main(String[] args){
      int my_input, i, j;
      System.out.println("Required packages have been imported");
      Scanner my_scanner = new Scanner(System.in);
      System.out.println("A reader object has been defined ");
      System.out.print("Enter the decimal number : ");
      my_input = my_scanner.nextInt();
      int[] my_octal = new int[100];
      System.out.println("The octal value is ");
      i = 0;
      while (my_input != 0) {
         my_octal[i] = my_input % 8;
         my_input = my_input / 8;
         i++;
      }
      for ( j = i - 1; j >= 0; j--)
         System.out.print(my_octal[j]);
   }
}

Output

Required packages have been imported
A reader object has been defined
Enter the decimal number : 8
The octal value is
10

Example 2

Here, the integer has been previously defined, and its value is accessed and displayed on the console.

public class DecimalToOctal {
   public static void main(String[] args){
      int my_input, i, j;
      my_input = 8;
      System.out.println("The decimal number is defined as " +my_input);
      int[] my_octal = new int[100];
      System.out.println("The octal value is ");
      i = 0;
      while (my_input != 0) {
         my_octal[i] = my_input % 8;
         my_input = my_input / 8;
         i++;
      }
      for ( j = i - 1; j >= 0; j--)
         System.out.print(my_octal[j]);
   }
}

Output

The decimal number is defined as 8
The octal value is
10