How to solve exception in thread "main" java.util.NoSuchElementException in Kotlin?

Question

import java.util.Scanner

fun main(args: Array<String>) {
    val reader = Scanner(System.`in`)
    print("Enter a number: ")
    var integer:Int = reader.nextInt()
    println("You entered: $integer")
}

Answer 1

You must check reaader.hasNextInt() before call reader.nextInt()

import java.util.Scanner

fun main(args: Array<String>) {
    val reader = Scanner(System.`in`)
    print("Enter a number: ")
    if (reader.hasNextInt()) {
        val integer = reader.nextInt()
        println("You entered: $integer")
    }
}