Kotlin Program:

Example:

import java.util.Scanner
fun main(args: Array<String>) {

    print("Enter 1st number : ")
    val userInput = Scanner(System.`in`)
    var n1:Int = userInput.nextInt()
    print("Enter 2nd number : ")
    var n2:Int =userInput.nextInt()

    n1 = n1 xor n2
    n2 = n2 xor n1
    n1 = n1 xor n2
    print("After Swapping\n Value of 1st number : $n1 \n Value of 2nd number : $n2")
}

Output:

  Enter 1st number : 7
  Enter 2nd number : 15
  After Swapping
  Value of 1st number : 15
  Value of 2nd number : 7

We are using binary XOR operator (^)

//Lets take n1=7, n2=3
n1 = n1 xor n2 //Here n1=4, n2=3
n2 = n2 xor n1 //Here n1=4, n2=7
n1 = n1 xor n2 //Finally n1=3, n2=7

Remember :
 A B (A xor B)
 0 0    0
 0 1    1
 1 0    1
 1 1    0