Csharp/C#核心/Lesson17_多态-vob练习/Program.cs

using System.Threading.Channels;

namespace Lesson17_多态_vob练习
{
    #region 鸭子题
    class Duck
    {
        public virtual void Speak()
        {
            Console.WriteLine("嘎嘎叫");
        }
    }
    class WoodDuck : Duck
    {
        public override void Speak()
        {
            Console.WriteLine("吱吱叫");
        }

    }
    class RubberDuck : Duck
    {
        public override void Speak()
        {
            Console.WriteLine("叽叽叫");
        }
    }
    #endregion

    #region 打卡题
    class Staff
    {
        public virtual void Clockin() 
        {
            Console.WriteLine("员工9点打卡");
        }
    }
    class Boss: Staff
    {
        public override void Clockin()
        {
            Console.WriteLine("老板11点打卡");
        }

    }
    class Programer : Staff
    {
        public override void Clockin()
        {
            Console.WriteLine("程序员无需打卡");
        }
    }
    #endregion

    #region 计算题
    class Graph
    {
        public virtual void Perimeter()
        {
            Console.WriteLine("未初始化图形无法计算");
        }
        public virtual void Area()
        {
            Console.WriteLine("未初始化图形无法计算");
        }
    }
    class Rectangle : Graph
    {
        public int x, y;
        public Rectangle(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
        public override void Perimeter()
        {
            Console.WriteLine("矩形周长为{0}", (x + y) * 2);
        }
        public override void Area()
        {
            Console.WriteLine("矩形面积为{0}", x * y);
        }
    }
    class Square : Graph
    {
        public int x;
        public Square(int x)
        {
            this.x = x;
        }

        public override void Perimeter()
        {
            Console.WriteLine("方的周长为{0}", x * 4);
        }
        public override void Area()
        {
            Console.WriteLine("方的面积为{0}", x * x);
        }
    }
    class Round : Graph
    {
        public double PI = 3.1415926;
        int r;
        public Round(int r)
        {
            this.r = r;
        }
        public override void Perimeter()
        {
            double perimeter = 2 * PI * r;
            Console.WriteLine("圆的周长{0}",perimeter);
        }
        public override void Area()
        {
            double areas = PI * r * r;
            Console.WriteLine("圆的面积{0}",areas);
        }
    }

    #endregion

    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            Duck realDuck = new Duck();
            realDuck.Speak();
            Duck woodDuck = new WoodDuck();
            woodDuck.Speak();
            Duck rubberDuck = new RubberDuck();
            rubberDuck.Speak();

            Programer p = new Programer();
            p.Clockin();
            Boss b = new Boss();
            b.Clockin();
            Staff s = new Staff();
            s.Clockin();
             
            Graph rectangle = new Rectangle(2,3);
            rectangle.Perimeter();
            rectangle.Area();
            Graph square = new Square(2);
            square.Perimeter();
            square.Area();
            Graph round = new Round(3);
            round.Perimeter();
            round.Area();

        }
    }
}