fun myFunction(param1: Int, param2: String): String { return "$param2 $param1" }// Declare a function in Kotlin fun happyBirthday(name: String, age: Int): String { return "Happy ${age}th birthday, $name!" } // Call function val greeting = happyBirthday("Anne", 32)fun sum(a: Int, b: Int): Int { return a + b }fun callMe() { println("Printing from callMe() function.") println("This is cool (still printing from inside).") } fun main(args: Array<String>) { callMe() println("Printing outside from callMe() function.") }// Use 'fun' keyword to declare function // 'num' is the parameter and is of type Int // The ':Int' indicates the return type fun square(num: Int):Int { return num * num }fun main() { println("This is a function") }fun main() { println("Hello, world!!!") x() } fun x(){ println("HELLO WORLD") }fun main(args: Array<String>) { var number = 5.5 print("Result = ${Math.sqrt(number)}") }kotlin function