玩法分析：

把三种手势设置三个数

1、石头  2、剪刀  3、布

玩家 - 电脑

玩家赢：只有以下3种结果，，，2个数，-1 和2

1 - 2 = -1；

2 - 3 = -1；

3 - 1 = 2；

平手：结果为0即为平手

电脑赢：else电脑赢

 

创建3个类：

玩家类（Player）：

方法：得到玩家的数，   

 

电脑类（Computer）：

方法：电脑出拳需要一个随机数

 

裁判（Judge）：

方法：判断输赢

代码如下：

玩家类

class Player    {        public int ShowFist(string fist)        {            int num = 0;            switch (fist)            {                case "石头": num = 1;                    break;                case "剪刀": num = 2;                    break;                case "布": num = 3;                    break;            }            return num;        }    }

电脑类

class Computer    {        /// 
        /// 存储电脑出的手势        /// 
        public string Fist        {            get;            set;        }        public int ShowFist()        {            Random r = new Random();            int rNum = r.Next(1, 4);            switch(rNum)            {                case 1: this.Fist = "石头";                    break;                case 2: this.Fist = "剪刀";                    break;                case 3: this.Fist = "布";                    break;            }            return rNum;        }    }

裁判类

public enum Result    {        玩家赢,        电脑赢,        平手    }    class Judge    {        public static Result Judged(int playerNum, int cpuNum)        {            if (playerNum - cpuNum == -1 || playerNum - cpuNum == 2)            {                return Result.玩家赢;            }            else if(playerNum - cpuNum == 0)            {                return Result.平手;            }            else            {                return Result.电脑赢;            }        }    }

主窗体类：

public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void label3_Click(object sender, EventArgs e)        {        }        private void btnStone_Click(object sender, EventArgs e)        {            string str = "石头";            PlayGame(str);        }        private void PlayGame(string str)        {            lblPlayer.Text = str;            Player player = new Player();            int playerNum = player.ShowFist(str);            Computer cpu = new Computer();            int cpuNum = cpu.ShowFist();            lblComputer.Text = cpu.Fist;            Result res = Judge.Judged(playerNum, cpuNum);            lblJudge.Text = res.ToString();        }        private void btnCut_Click(object sender, EventArgs e)        {            string str = "剪刀";            PlayGame(str);        }        private void btnNo_Click(object sender, EventArgs e)        {            string str = "布";            PlayGame(str);        }    }