Kotlin is a fun programming language, and so the function name begins with the word fun. The fun statement is followed by the function name with parentheses ( ). The code block is defined after the parenthesis within the curly brackets as { code block }. Once we have finished writing our code block, we can call this function from anywhere by using nameOfTheFunction. Writing hello function displays a greeting message on the screen. See the following example:

fun hello(){
    println("Hello from Kotlin")
 }
 fun main(args: Array<String>) {
    hello()
 }

A simple Hello from Kotlin message will now display on the screen.