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+n2;
    n2=n1-n2;
    n1=n1-n2;
    print("After Swap\n 1st number : $n1 \n 2nd number : $n2")
}

Output:

  Enter 1st number : 7
  Enter 2nd number : 15
  After Swap
  1st number : 15
  2nd number : 7

Here we are adding both values into one then used some maths

//Lets take n1=7, n2=3;

n1=n1+n2; //n1=7+3=10
n2=n1-n2; //n2=10-3=7
n1=n1-n2; //n1=10-7=3

//Finally you swaped & get n1=3, n2=7;