Java Program to Illustrate the usage of Octal Integer

Octal is a number system where a number is represented in powers of 8. So all the integers can be represented as an octal number. Also, all the digit in an octal number is between 0 and 7. In java, we can store octal numbers by just adding 0 while initializing. They are called Octal Literals. The data type used for storing is int. 

The method used to convert Decimal to Octal is Integer.toOctalString(int num)

Syntax:

public static String toOctalString(int num)

Parameters: The method accepts a single parameter num of integer type which is required to be converted to a string.

Return Value: The function returns a string representation of the integer argument as an unsigned integer in base 8.

Example 1

Java

import java.io.*;

class GFG {
    public static void main(String[] args)
    {
        // Variable Declaration
        int a;

        // storing normal integer value
        a = 20;
        System.out.println("Value of a: " + a);

        // storing octal integer value
        // just add 0 followed octal representation
        a = 024;
        System.out.println("Value of a: " + a);

        // convert octal representation to integer
        String s = "024";
        int c = Integer.parseInt(s, 8);
        System.out.println("Value of c: " + c);

        // get octal representation of a number
        int b = 50;
        System.out.println(
            "Octal Representation of the number " + b
            + " is: " + Integer.toOctalString(b));
    }
}

Output

Value of a: 20
Value of a: 20
Value of c: 20
Octal Representation of the number 50 is: 62

The time complexity is O(1), meaning it is constant time.

The auxiliary space complexity is also O(1). 

Example 2: The different arithmetic operation can also be performed on this octal integer. Operation is the same as performed on the int data type.

Java

// Arithmetic operations on Octal numbers

import java.io.*;

class GFG {
    public static void main(String[] args)
    {
        int a, b;

        // 100
        a = 0144;

        // 20
        b = 024;

        System.out.println("Value of a: " + a);
        System.out.println("Value of b: " + b);
        System.out.println("Addition: " + (a + b));
        System.out.println("Subtraction: " + (a - b));
        System.out.println("Multiplication: " + (a * b));
        System.out.println("Division: " + (a / b));
    }
}

Output

Value of a: 100
Value of b: 20
Addition: 120
Subtraction: 80
Multiplication: 2000
Division: 5