Custom Method to Convert Octal to Decimal

Algorithm

Start and take the octal input from the user.

Create a result variable with an initial value of 0 to store the resultant Decimal number.

Create a loop for getting every digit in the Input.

Multiply each digit in the number with 8^n-1, where n is the digit’s position.

Then add it to the result.

Store the value in Step(5) to the result variable.

Print the result variable.

Java Program for Octal to Decimal Number Conversion Using Custom Method

Java

// Java program to convert octal
// to decimal number using custom code
import java.lang.Math;
 
// Driver Class
public class Main {
    // main function
    public static void main(String[] args)
    {
        int a = 167;
 
        // Initialize result variable to 0.
        int result = 0;
 
        // Take a copy of input
        int copy_a = a;
 
        for (int i = 0; copy_a > 0; i++) {
 
            // Take the last digit
            int temp = copy_a % 10;
 
            // Appropriate power on 8 suitable to
            // its position.
            double p = Math.pow(8, i);
 
            // Multiply the digits to the  into the Input
            // and
            //  then add it to result
            result += (temp * p);
            copy_a = copy_a / 10;
        }
 
        System.out.print("Decimal of Octal Number (" + a
                         + ") : " + result);
    }
}

Output

Decimal of Octal Number (167) : 119

The complexity of the above method:

Time complexity: O(logN) for given octal number N

Please refer to the article Program for Octal to Decimal Conversion for more information.

Java Program to Convert Octal to Decimal

The octal numbers are numbers with 8 bases and use digits from 0-7. This system is a base 8 number system. The decimal numbers are the numbers with 10 as their base and use digits from 0-9 to represent the decimal number. They also require dots to represent decimal fractions.

We have to convert a number that is in the Octal Number System to the Decimal Number System. The base in an Octal Number is 8, which means that an Octal Number will have digits ranging from 0 to 7.

For Example:

In Octal: 167

In Decimal:(7 * 8⁰) + (6 * 8¹) +(1 * 8²)=119

The below diagram explains how to convert an octal number (123) to an equivalent decimal value:

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1. Using Integer.parseInt() method

Custom Method to Convert Octal to Decimal

Algorithm

Java Program for Octal to Decimal Number Conversion Using Custom Method

Java

The complexity of the above method:

Java Program to Convert Octal to Decimal

For Example:

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