Java Program to Convert Octal to Decimal 2022 (updated)

Java Program to Convert Octal to Decimal 2022 ( updated ) – Generally Octal number system used to store big data values. In the previous post, we had developed a Java program to convert decimal to octal value. Now in this post, we will develop a Java program to convert the octal value to decimal value.

• Decimal Octal
• 1 1
• 2 2
• 3 3
• 4 4
• 5 5
• 6 6
• 7 7
• 8 10
• 9 11
• 10 12

In Octal number system 8 and 9 are not available because their base is 8.

Procedure to develop a method to convert octal to decimal,

• Take an octal number
• Declare variables decimal, remainder, multiplier, and iteration variable
• Calculate the remainder after dividing by base of decimal that is 10
• Calculate the multiplier value. In each iteration multiplier = 8^i
• Increase decimal value as, decimal = decimal + (remainder * multiplier)
• Update octal number through dividing it by 10
• Increase the iteration variable by 1
• Repeat 3 to 7 steps until the octal number becomes 0

Java Program to Convert Octal to Decimal

 

import java.util.Scanner;

public class NumberConversion {
  private static int toDecimal(int octal) {

     // declare variables
     int decimal = 0;
     int remainder = 0;
     int multiplier = 0;
     int i = 0; 

     while (octal!=0) {
        // find remainder after 
        // dividing by 8
        remainder = octal % 10;

        // calculate multiplier value
        multiplier = (int) Math.pow(8, i);
        // increase decimal value
        decimal += (remainder * multiplier);

        // divide decimal value by 8
        octal /= 10;
        // increase i value by 1
        i++;
     }

     return decimal;
  }

  public static void main(String[] args) {

     // declare variables
     int decimal = 0;
     int octal = 0;

     // create Scanner class object
     Scanner scan = new Scanner(System.in);

     // read input
     System.out.print("Enter octal number::");
     octal = scan.nextInt();

     // convert decimal to decimal
     decimal = toDecimal(octal);

     // display result
     System.out.println("Decimal value = " 
                              + decimal);

     // close Scanner class object
     scan.close();
  }
}

OUTPUT

Enter octal number:: 12
Decimal value = 10

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• Merge Sort
• Insertion Sort
• Selection Sort
• Heap Sort
• Radix Sort
• Bucket Sort

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