kotlin 小数点で四捨五入を実行する

import kotlin.math.roundToInt

値.roundToInt()

import kotlin.math.roundToInt

fun main() {

    var x: Double = 123.45
    var y: Double = 123.99

    check(x.roundToInt()) // 123 is Int
    check(y.roundToInt()) // 124 is Int

}

fun check(x: Any?){
    when (x) {
        is Byte -> println("$x is Byte")
        is Int -> println("$x is Int")                
        is Double -> println("$x is Double")
        is Char -> println("$x is Char")
        is String -> println("$x is String")        
        is Boolean -> println("$x is Boolean")  
    }
}