Java Code to Exchange the values of two variables without using temporary variable

Problem:

Exchange the values of two variables without using temporary variable.

Algorithm:

1. Get the values of a and b.
2. Calculate the sum of a and b and assign to a.
3. Calculate the difference of a and b and assign to b.
4. Calculate the difference of a and b and assign to a.
5. Print the values.

Solution:

import java.util.Scanner;

public class ExchangeTwoValuesWithoutUsingTempVariable {

         static int a,b;

         public static void main(String[] args) {
             getTheValues();
             System.out.println("Before exchange the values are " + a + " " + b);
              exchangeValues();
            System.out.println("After exchange the values are " + a + " " + b);
         }

         private static void getTheValues(){
              Scanner s = new Scanner(System.in);
              System.out.println("Enter the value of a: ");
              a = s.nextInt();
              System.out.println("Enter the value of b: ");
               b = s.nextInt();
        }

        private static void exchangeValues(){
               a= a+b;
               b = a -b;
               a= a-b;
        }
}

Output:

Enter the value of a:
30
Enter the value of b:
3
Before exchange the values are 30 3
After exchange the values are 3 30