using System;

public class Program

{

    public static void Main()

    {

        BaseA a = new BaseA();

        Console.WriteLine(a.getA());

        Console.WriteLine(a.getprotectA());

        Console.WriteLine(a.getPrivateA());

        Console.WriteLine(a.a);

        Console.WriteLine("---------------------------------------------------------");

        BaseA a1 = new A();

        Console.WriteLine(a1.getA());

        Console.WriteLine(a1.getprotectA());

        //Console.WriteLine(a1.getbaseprotectA()); //這行會出錯，因為baseA沒有這個函數

        Console.WriteLine(a1.getPrivateA());

        Console.WriteLine(a1.a);

        Console.WriteLine("---------------------------------------------------------");

        A a2 = a1 as A;

        Console.WriteLine(a2.getA());

        Console.WriteLine(a2.getprotectA());

        Console.WriteLine(a2.getbaseprotectA());

        Console.WriteLine(a2.getPrivateA());

        Console.WriteLine(a2.a);

    }

    class BaseA

    {

        public string a = "baseA";

        public string getA()

        {

            return a;

        }

        public virtual string getprotectA()

        {

            return protectA();

        }

        protected string protectA()

        {

            return a + " base protected";

        }

        public string getPrivateA()

        {

            return privateA();

        }

        private string privateA()

        {

            return a + " base private";

        }

    }

    class A : BaseA

    {

        public A()

        {

            a = "A";

        }

        public new string getPrivateA()

        {

            return privateA();

        }

        private string privateA() //private的屬性或函數無法繼承

        {

            return "private" + a;

        }

        public string getbaseprotectA()

        {

            return base.protectA();

        }

        public override string getprotectA()//可以試試看拿掉override看看會有什麼樣的效果

        {

            return protectA();

        }

        protected new string protectA()

        {

            return "protected new" + a;

        }

    }

}