Java Program to Swap Two Numbers Without using the Third Variable

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.

• Swap two numbers using third variable in java

Now let us see without using the third variable.

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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.

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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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