How to swap two numbers in Kotlin

To Swap 2 numbers in Kotlin we can declare a third temporary variable.

Assuming we have a = 1, b =2

And Temporary variable called x

1- We set value of temporary from first variable. x = 1 (a)
2- We set value of First variable from Second variable. a = 2 (b)
3- We set value of second variable from temporary variable b = 1 (x)

Example

import java.util.*


fun main(arg: Array<String>) {
    
    var first = 1;
    
    var second = 2;    
    
    println("Numbers Before Swap : first = $first second = $second ")
    
    var temp = first
    first = second
    second = temp
    
    println("Numbers After  Swap : first = $first second = $second ")
}

Output

Numbers Before Swap : first = 1 second = 2
Numbers After Swap : first = 2 second = 1

Conclusion

In this page (written and validated by A. Gawali) you learned about How to swap two numbers in Kotlin . What's Next? If you are interested in completing Kotlin tutorial, we encourage you simply to start here: Kotlin Tutorial.

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