Question

How to swap two numbers without using a third variable (temp) in Kotlin

Answer 1

// Using also

fun main() {
    var a = 10
    var b = 20

    a = b.also { b = a }

    println("a = $a")
    println("b = $b")
}


/*
run:

a = 20
b = 10

*/

 

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Answer 2

// Arithmetic Swap

fun main() {
    var a = 10
    var b = 20

    a = a + b
    b = a - b
    a = a - b

    println("a = $a")
    println("b = $b")
}


/*
run:

a = 20
b = 10

*/

 

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Answer 3

// XOR Swap

fun main() {
    var a = 10
    var b = 20

    a = a xor b
    b = a xor b
    a = a xor b

    println("a = $a")
    println("b = $b")
}


/*
run:

a = 20
b = 10

*/

 

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Answer 4

// Using a Pair

fun main() {
    var a = 10
    var b = 20

    val (newA, newB) = Pair(b, a)
    a = newA
    b = newB

    println("a = $a")
    println("b = $b")
}


/*
run:

a = 20
b = 10

*/

 

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