C# Primer Plus编程练习10.17

using System;



namespace ConsoleApplication1
{
    class Car                                                //单个汽车   
    {
        private int position;                                //私有成员

        public Car()                                        //默认构造函数
        {
            this.position=0;
        }
        public Car(int position)                            //带参构造函数
        {
            this.position=position;
        }
        public int Position                                    //只读属性
        {
            get{return(position);}
        }
        public void Move(int distance)                //移动位置，永久改变this.position值
        {
            this.position+=distance;
        }
    }
    


    class CarGame                                            //包含5个car的容器
    {
        private Car[] cars;
        
        public CarGame()                                    //构造函数
        {
            cars=new Car[5];
            int newPosition;
            for(int i=0;i<5;i++)
            {
                Console.WriteLine("请输入第{0}辆车的位置：",i+1);
                newPosition=Convert.ToInt32(Console.ReadLine());
                cars[i]=new Car(newPosition);
            }
        }
        public int this [int index]                            //索引    
        {
            get
            {
                if((index<0)||(index>=cars.Length))
                {
                    Console.WriteLine("index error!");
                    return 0;                                //return语句不能丢，否则会出错
                }
                else
                    return cars[index].Position;
            }
        }
        public void CarMove(int index,int distance)            //调用元素的成员函数
        {
            cars[index].Move(distance);
        }
        public void Browse()                                //遍历cars的position成员
        {
            for(int i=0;i<5;i++)
            {
                Console.WriteLine("第{0}辆车的位置是：{1}",i+1,cars[i].Position);
            }
        }
    }
   
    


    class Test
    { 
        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        public static int Main()
        {
            //
            // TODO: 在此处添加代码以启动应用程序
            //
            CarGame myCarGame;
            Console.WriteLine("5辆车，初始化其位置");
            myCarGame=new CarGame();
            Console.WriteLine("遍历其位置");
            myCarGame.Browse();

            Console.WriteLine("***********************************************************************");

            do
            {
                Console.WriteLine("选择任务：\nM或m，回车：移动车的位置；\nS或s，回车：检索制定车的位置\nB或b，回车：遍历所有车此刻的位置。");
                string temps=(Console.ReadLine()).ToUpper();
            
                switch(temps)
                {
                    case "M":
                        Console.WriteLine("移动车的位置");
                        do
                        {
                            int index;
                            do
                            {
                                Console.WriteLine("在1至5辆车中选择需要移动位置的");
                                index=Convert.ToInt32(Console.ReadLine())-1;
                                if(index>=0&&index<=4)
                                    break;
                                Console.WriteLine("出错！请重新输入");
                            }
                            while(true);
                            Console.WriteLine("输入需要移动的值，输入正整数向前移动，负整数向后移动，其他出错");
                            int distance=Convert.ToInt32(Console.ReadLine());
                            myCarGame.CarMove(index,distance);
                            Console.WriteLine("移动后，该辆车现在的位置是："+myCarGame[index]);
                            Console.WriteLine("完成移动任务了吗？按Y或y并回车完成，其他键并回车继续");
                            string temp=(Console.ReadLine()).ToUpper();
                            if(temp=="Y")
                                break;
                        }
                        while(true);
                        break;
                    case "S":
                        Console.WriteLine("检索某辆车的位置");
                        do
                        {
                            int index;
                            do
                            {
                                Console.WriteLine("在1至5辆车中选择需要检索位置的");
                                index=Convert.ToInt32(Console.ReadLine())-1;
                                if(index>=0&&index<=4)
                                    break;
                                Console.WriteLine("出错！请重新输入");
                            }
                            while(true);
                            Console.WriteLine("第{0}辆车现在的位置是：{1}",index,myCarGame[index]);
                            Console.WriteLine("完成检索任务了吗？按Y或y并回车完成，其他键并回车继续");
                            string temp=(Console.ReadLine()).ToUpper();
                            if(temp=="Y")
                                break;
                        }
                        while(true);
                        break;
                    case "B":
                        Console.WriteLine("遍历车的位置");
                        myCarGame.Browse();
                        break;
                    default:
                        Console.WriteLine("没有这个选项，请重新选择！");
                        break;
                }
                Console.WriteLine("\n\n\n所有的任务都完成了吗？按Y或y并回车退出，其他键并回车继续");
                string temper=(Console.ReadLine()).ToUpper();
                if(temper=="Y")
                    break;
            }
            while(true);


            //
            //结束程序
            //
            Console.WriteLine("\nThanks for using!\nPress Enter to cancle");
            Console.ReadLine();

            return(0);
        }
    }
}

  这是我第一个正规的C#程序，因为是三、初学，还没有用异常处理以及其他更高级的东西，纯粹是练习来着。
  这是个汽车游戏模拟，Car是汽车类，CarGame是容器类，里面包含5个Car。其实用ArrayList更合适，但为了练习，我没有使用。
  构造函数重载用this更好，我在另一个程序里练习了。get访问器里每一个子句都要有return，不然会出错。在方法里，成员也可能被修改，比如Car.Move方法，我想可能是没有建立其拷贝。main方法里用了switch语句和do-while语句，为了是程序更“合理”，但我不喜欢这么长的main，如果没必要的话以后就不会这样了，只是拿来测试类的功能。

转载于:https://www.cnblogs.com/BlueskyGreenearth/archive/2005/03/23/124471.html