Kotlin exercise

package com.example.myfirstkotlin

class MyClass {

    fun main(args: Array<String>) {
        print("Hello world")
    }

    fun valuesPrinter(vararg values: Int) {
        var greatest: Int = values.get(0)
        var smallest: Int = values.get(0)
        var avg: Int = 0
        var numOfFailures: Int = 0
        values.forEach {
//            if (it < 55) {
//                numOfFailures += 1
//            }
            avg += it
            if (it > greatest) greatest = it
            if (it < smallest) smallest = it
        }
        avg /= values.size
        numOfFailures = values.filter { it < 55 }.size
        println("Average is: $avg")
        println("Greatest is: $greatest")
        println("Smallest is: $smallest")
        println("Number of failures is: $numOfFailures")
    }

    fun rectangleData(x: Double, y: Double) {
        val area = x * y
        val perim = 2 * (x + y)
        val diag = Math.sqrt(Math.pow(x, 2.0) + Math.pow(y, 2.0))
        println("Area is: $area")
        println("Perimeter is: $perim")
        println("Diagonal is: $diag")
    }
}