Kotlin Program to Swap Two Numbers

Swapping two numbers is a common programming task that involves exchanging the values of two variables. Kotlin, being a modern and concise programming language, provides several ways to achieve this. In this article, we’ll explore three different Kotlin Program to Swap Two Numbers including explanations and output for each example.

Solution 1: Using a Temporary Variable

The most straightforward way to swap two numbers is by using a temporary variable. This method temporarily holds one of the values during the swap process.

Code Example

fun main() {
    var a = 5
    var b = 10
    println("Before swap: a = $a, b = $b")

    val temp = a
    a = b
    b = temp

    println("After swap: a = $a, b = $b")
}

Output

Before swap: a = 5, b = 10
After swap: a = 10, b = 5

In this example, the values of a and b are swapped using a temporary variable temp. Initially, a is 5 and b is 10. After the swap, a becomes 10 and b becomes 5.

Solution 2: Using Arithmetic Operations

You can swap two numbers without using a temporary variable by using arithmetic operations. This method utilizes addition and subtraction to perform the swap.

Code Example

fun main() {
    var a = 15
    var b = 20
    println("Before swap: a = $a, b = $b")

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

    println("After swap: a = $a, b = $b")
}

Output

Before swap: a = 15, b = 20
After swap: a = 20, b = 15

Solution 3: Using Destructuring Declarations

Kotlin provides a more elegant way to swap two variables using destructuring declarations. This method leverages Kotlin’s ability to simultaneously assign multiple variables.

Code Example

fun main() {
    var a = 25
    var b = 30
    println("Before swap: a = $a, b = $b")

    a = b.also { b = a }

    println("After swap: a = $a, b = $b")
}

Output

Before swap: a = 25, b = 30
After swap: a = 30, b = 25

In this example, the values of a and b are swapped using the also function and destructuring declarations. Initially, a is 25 and b is 30. After the swap, a becomes 30 and b becomes 25.

Conclusion

Swapping two numbers is a fundamental task in programming, and Kotlin offers several ways to achieve this. We explored three different methods: using a temporary variable, using arithmetic operations, and using destructuring declarations. Each method has its advantages and can be chosen based on the specific requirements of the problem at hand.

By understanding and implementing these solutions, you can effectively swap numbers in Kotlin and enhance your programming skills. Whether you’re a beginner or an experienced developer, mastering these techniques will be valuable in various coding scenarios. Happy coding!

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