//函式公開訪問
   public func show(){
        print("姓名:\(name),年齡:\(age),身高:\(height)")
    }
    deinit{
        self.name=""
        self.age=""
        print("呼叫了函式")
    }
//列印
//呼叫
var DyStudent:Student?=Student(name: "小王", age: "20歲")
DyStudent!.name="小剛"
//DyStudent.name="小王"
DyStudent!.run()
print(DyStudent!.height)
DyStudent!.show()
DyStudent = nil