fun birthdayGreeting(name: String): String {
val nameGreeting = "Happy Birthday, $name!"
val ageGreeting = "You are now 5 years old!"
return "$nameGreeting\n$ageGreeting"
}

No main method found in project.

Can someone explain how to solve this, I've just started taking this code labs. thanx in advance.

CodePudding user response：

Kotlin needs a main function so that when you actually run it, it knows what to do.

fun main() {
    println(birthdayGreeting("John Doe"))
}

fun birthdayGreeting(name: String): String {
    val nameGreeting = "Happy Birthday, $name!"
    val ageGreeting = "You are now 5 years old!"
    return "$nameGreeting\n$ageGreeting"
}

CodePudding user response：

Shan perera, It is nice to see you here. Will explain.

When we usually run a program [piece of code]. The entry point, we call as main().

This function

fun birthdayGreeting(name: String): String {
    val nameGreeting = "Happy Birthday, $name!"
    val ageGreeting = "You are now 5 years old!"
    return "$nameGreeting\n$ageGreeting"
}

it Looks good for printing 5 year old boy birthday wishes. well for executing this function we have to create a main() method. In Kotlin you must follow the syntax like this.

fun main() {
    println(birthdayGreeting("Arnold"))
}

We can write it as

fun main(args: Array<String>) {
    println(birthdayGreeting("Arnold"))
}

Then defently it will print

Happy Birthday, Arnold! You are now 5 years old!