using System;

public class Program

{

    public static void Main()

    {

Car carA = new Car("Honda", "Crv", "RegistrationA", "2014", 21000);

Console.WriteLine(carA);//如果不覆寫 subclass.ToString()，會回傳Program+Car

//Toyota carB = new Toyota("Prius", "RegistrationB", "2014", 23000);

//Console.WriteLine(carB);

//Console.WriteLine(carB.Moving());

//Console.WriteLine(carB.Stop());

//Console.WriteLine(carB.OnlyToyotaCanDo());

    }

public class Car{

//Field，Database    

public string _make;

public string _type;

public string _registration;

public string _year;

//The constructor method

public Car(string make, string type, string registration, string year, double currentValue){

    _make = make;

    _type = type;

    _registration = registration;

    _year = year;

    CurrentValue = currentValue;}

//Properties is special method to replace get and set.

public string Year{get { return _year; }set { this._year = value; }}

public double CurrentValue { get; set; }

public string Make { get { return _make; } }

public string Type { get { return _type; } }

public string GetRegistration(){return _registration;}

public void SetRegistration(string registration){_registration = registration;}

/// <returns>full car information</returns>

public override string ToString(){//覆寫 subclass.ToString()

    return 

            "Car Make:"+_make+"\n"+

            "Car Type:"+_type+"\n"+

            "Car Registration:"+_registration+"\n"+

            "Car Year:"+_year+"\n"+

            "Current Value:"+CurrentValue+"\n";}

public string Stop(){return "Car has stopped.";}}}//一定要寫這行，代表他屬於IVehicle

​

public class Toyota : Car{

public Toyota(string type, string registration, string year, double currentValue) : base("Toyota", type, registration, year, currentValue){}

public string OnlyToyotaCanDo(){

    return "This is an action or method which ONLY " + this.Make + " can do.";}

public override string Stop(){

    return this.Make + " Car is Stop.";}}}

public class Mazda :Car{

public Mazda(string type, string registration, string year, double currentValue) : base("Mazda", type, registration, year, currentValue){}

public string OnlyMazdaCanDo(){

    return "This is an action or method which ONLY " + this.Make + " can do.";}}}