fun main() {
/*  val javac = 0
    val javac2 = -1


    // when 表達式 箭頭：減號+大于號
   when{
       javac > javac2 ->  println("大于")
       javac == javac2 ->  println("等于")
       javac - 1 < 1 -> println("1")
       else -> println("其他情況")
   }
   */
    var str ="張三"
    when(str) {
        "張三" -> println("zhangsan")
        "李四" -> println("lisi")
        "王五" -> println("wangwu")
        "趙六" -> println("zhaoliu")
        else -> println("查無此人")
    }