c#继承练习题（2018/07/04）

0:
应用程序，该程序包括3个类：Monkey类、People类和主类E。要求：
(1) Monkey类中有个构造方法：Monkey (String s)，并且有个public void speak()方法，在speak方法中输出“咿咿呀呀……”的信息。
(2)People类是Monkey类的子类，在People类中定义方法speak(),在speak方法中输出“不错嘛！会说话了！”的信息。
(3)在People类中新增方法void think()，在think方法中输出“别说话！认真思考！”的信息。
(4)在主类E的main方法中创建Monkey与People类的对象类测试这2个类的功能。
Monkey：

using System;

namespace cchoop
{
    class Monkey
    {
        public Monkey() { }
        public Monkey(string s)
        {

        }

        public virtual void Speak()
        {
            Console.WriteLine("咿咿呀呀......");
        }
    }
}

People ：

using System;

namespace cchoop
{
    class People : Monkey
    {
        public override void Speak()
        {
            Console.WriteLine("不错嘛！会说话了！");
        }

        public void Think()
        {
            Console.WriteLine("别说话！认真思考！");
        }
    }
}

测试：

using System;

namespace cchoop
{
    class Program
    {
        static void Main(string[] args)
        {
            Monkey monkey = new Monkey();
            monkey.Speak();
            Monkey people = new People();
            people.Speak();
            People people2 = new People();
            people2.Think();
        }
    }
}

---

1;
设计一个汽车类Vehicle，包含的属性有车轮个数wheels和车重weight。
小车类Car是Vehicle的子类，其中包含的属性有载人数loader。
卡车类Truck是Car类的子类，其中包含的属性有载重量payload。
每个类都有构造方法和输出相关数据的方法。
最后，写一个测试类来测试这些类的功能。

using System;

namespace cchoop
{
    class Program
    {
        static void Main(string[] args)
        {
            Vehicle car = new Car(4, 100, 4);
            car.PrintInfo();
            Vehicle truck = new Truck(2, 200, 2, 2000);
            truck.PrintInfo();
        }
    }
    class Vehicle
    {
        protected int wheels;   //车轮数
        protected float weight;   //车重

        public Vehicle(int wheels, float weight)
        {
            this.wheels = wheels;
            this.weight = weight;
        }
        public virtual void PrintInfo()
        {
            Console.WriteLine("wheels:{0},weight:{1}", wheels, weight);
        }
    }
    class Car : Vehicle
    {
        protected int loader;    //载人数
        public Car(int wheels, float weight, int loader)
            : base(wheels, weight)
        {
            this.loader = loader;
        }
        public override void PrintInfo()
        {
            Console.WriteLine("wheels:{0},weight:{1},loader:{2}", wheels, weight, loader);
        }
    }
    class Truck : Car
    {
        private float payload;  //载重
        public Truck(int wheels, float weight, int loader, float payload)
            : base(wheels, weight, loader)
        {
            this.payload = payload;
        }
        public override void PrintInfo()
        {
            Console.WriteLine("wheels:{0},weight:{1},loader:{2}，payload:{3}", wheels, weight, loader, payload);
        }
    }

}

---

2;
（1）定义一个类，描述一个矩形，包含有长、宽两种属性，和计算面积方法。
（2）编写一个类，继承自矩形类，长方体，具有长、宽、高属性，和计算体积的方法。
（3）编写一个测试类，对以上两个类进行测试，创建一个长方体，定义其长、宽、高，输出其底面积和体积。

using System;

namespace cchoop
{
    class Program
    {
        static void Main(string[] args)
        {
            Rectangle rectangle = new Rectangle(2, 2, 1.5f);
            Console.WriteLine("长方体底面积：{0}", rectangle.GetArea());
            Console.WriteLine("长方体面积：{0}", rectangle.GetVolume());
        }
    }
    /// <summary>
    /// 矩形类
    /// </summary>
    class Squareness
    {
        protected float length;
        protected float width;

        public Squareness(float length, float width)
        {
            this.length = length;
            this.width = width;
        }

        public float GetArea()
        {
            return length * width;
        }
    }
    /// <summary>
    /// 长方体
    /// </summary>
    class Rectangle : Squareness
    {
        private float height;

        public Rectangle(float length, float width, float height)
            : base(length, width)
        {
            this.height = height;
        }
        public float GetVolume()
        {
            return length * width * height;
        }
    }


}

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