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Java Program to Swap Two Numbers Without using the Third Variable

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This post covers the Java Program to swap two numbers without using the third variable. It is easy to swap two numbers using the third variable, we assigned one to a temporary(temp) variable and swap with others.

Now let us see without using the third variable.

Explanation:
With the help of a Scanner class, we take the user input for two integers (a = 5, b = 3).
Now during the process of swapping, we assigned the value of a equal to the sum of a and b that is,
a = a + b;
(a = 5+3 = 8).

Second, we assigned the value of b equal to the difference between a and b that is,
b = a - b
(b= 8 – 3 = 5).

Lastly, we assigned the value of a equal to the difference between a and b that is,
a = a - b
(a= 8 – 5 = 3).

Then print those swapped values as shown in the program below.

Java program to swap two numbers without using Third Variable

//Swapping of two numbers

import java.util.Scanner;
class SwapTwoNumbers
{
   public static void main(String args[])
   {

    int a, b;
    System.out.println("Enter the two numbers, a and b");

    Scanner in = new Scanner(System.in);

    a = in.nextInt();
    b = in.nextInt();
  
    System.out.println("Values before Swapping\na = "+a+"\nb = "+b);
    
    a = a + b;
    b = a - b;
    a = a - b;

    System.out.println("Values after Swapping without third variable\na = "+a+"\nb = "+b);
   }
}

Output:

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