go chapter 7 - 类型

interface{}

func MyPrintf(args ...interface{}) {
    for _, arg := range args {
        switch arg.(type) {
            case int:
                fmt.Println(arg, "is an int value.")
            case string:
                fmt.Println(arg, "is a string value.")
            case float64:
                fmt.Println(arg, "is an float64 value.")
            case bool:
                fmt.Println(arg, "is an bool value.")
            default:
                fmt.Println(arg, "is an unknown type.")
         }
    }
}