Write a Java Program to swap two numbers without using the third variable.

Rest all things will be the same as the above program. Only the logic will change. Here, we are assigning x with the value x + y which means x will have a sum of both x and y.

Then, we are assigning y with the value x – y which means we are subtracting the value of y from the sum of (x + y). Till here, x still has the sum of both x and y. But y has the value of x.

Finally, in the third step, we are assigning x with the value x – y which means we are subtracting y (which has the value of x) from the total (x + y). This will assign x with the value of y and vice versa.

1	import java.util.Scanner;

2

3	class SwapTwoNumberWithoutThirdVariable

4

{

5	public static void main(String args[])

6

{

7

int x, y;

8	System.out.println("Enter x and y");

9	Scanner in = new Scanner(System.in);

10

11	x = in.nextInt();

12	y = in.nextInt();

13

14	System.out.println("Before Swapping\nx = "+x+"\ny = "+y);

15

16	x = x + y;

17	y = x - y;

18	x = x - y;

19

20	System.out.println("After Swapping without third variable\nx = "+x+"\ny = "+y);

21

}

22

}

Output:

Enter x and y
45
98
Before Swapping
x = 45
y = 98
After Swapping without a third variable
x = 98
y = 45