using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace _17复习{    class Program    {        static void Main(string[] args)        {            //Truck t = new Truck("解放牌","绿色",500);            //t.Lahuo();            //Car c = new Car("红旗","黑色",5);            //c.Laren();            //-----------------------------------------------------------------            //定义的父类，赋的值是子类            //Shape shape = new Circle(5);            //double area = shape.GetArea();            //double perimeter = shape.GetPerimeter();            //Console.WriteLine("面积是{0:0.00},周长是{1:0.00}",area,perimeter);            //Shape squ = new Square(4,3);            //double are = squ.GetArea();            //double per = squ.GetPerimeter();            //Console.WriteLine("面积是{0:0.00},周长是{1:0.00}", are, per);            //-----------------------------------------------------------------            //接口实现多态，声明的是接口            IBark bark = new RealDuck();            bark.Bark();        }    }    class Duck    {        public void Swim()        {            Console.WriteLine("鸭子都会游泳");        }    }    interface IBark    {        void Bark();    }    class XPDuck : Duck, IBark    {        public void Bark()        {            Console.WriteLine("橡皮鸭唧唧叫");        }    }    class RealDuck : Duck, IBark    {        public void Bark()        {            Console.WriteLine("真鸭子嘎嘎叫");        }    }    class MuDuck : Duck    {          }    //-----------------------------------------------------------------    abstract class Shape    {        public abstract double GetArea();        public abstract double GetPerimeter();    }    class Circle : Shape    {        public double R { get; set; }        public Circle(double r)        {            this.R = r;        }        public override double GetArea()        {            return Math.PI * this.R * this.R;        }        public override double GetPerimeter()        {            return 2 * Math.PI * this.R;        }    }    class Square : Shape    {        public double Height { get; set; }        public double Width { get; set; }        public Square(double height,double width)        {            this.Height = height;            this.Width = width;        }        public override double GetArea()        {            return this.Height * this.Width;        }        public override double GetPerimeter()        {            return (this.Height + this.Width) * 2;        }    }    //-------------------------------------------------------------------------------------------    class Vehicle    {        public string Brand { get; set; }        public string  Color { get; set; }        public void Run()        {            Console.WriteLine("是车都能跑");        }        public Vehicle(string brand,string color)        {            this.Brand = brand;            this.Color = color;        }    }    class Truck : Vehicle    {        public double Weight { get; set; }        public Truck(string brand,string color,double weight) : base(brand, color)        {            this.Weight = weight;        }        public void Lahuo()        {            Console.WriteLine("卡车可以拉{0}KG货",this.Weight);        }    }    class Car :Vehicle    {        public int Passenger { get; set; }        public Car(string brand,string color,int passenger) : base(brand, color)        {            this.Passenger = passenger;        }        public void Laren()        {            Console.WriteLine("轿车可以拉{0}人",this.Passenger);        }    }    //-------------------------------------------------------------------------------------------    class Father    {        public string LastName { get; set; }        public double Property { get; set; }        public string BloodType { get; set; }        public Father(string lastName,double property,string bloodType)        {            this.LastName = lastName;            this.Property = property;            this.BloodType = bloodType;        }    }    class Son : Father    {        //默认调用无参构造函数        public Son(string lastName,double property,string bloodType):base(lastName,property,bloodType)        {        }        public void PlayGame()        {            Console.WriteLine("儿子玩游戏");        }    }    class Daughter : Father    {        public Daughter(string lastName,double property,string bloodType) : base(lastName, property, bloodType)        {        }        public void Dance()        {            Console.WriteLine("女儿会跳舞");        }    }}