kotlin Any型を使用する

fun main() {

    hoge(1)
    hoge(1.23)
    hoge('a')
    hoge("abc")    

}

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

}

1 is Int
1.23 is Double
a is Char
abc is String