int b = 0;
            for (int i = 0; b != 5; i++)
            {
                // 计算机出拳
                int a, c = 0, d = 0, e = 0;
                Random r = new Random();
                a = r.Next(1, 3);
                Console.WriteLine("请出拳：其中1代表拳头；2代表剪刀；3代表布");
                b = Convert.ToInt32(Console.Read());

                Console.WriteLine("你出拳为{1}  +  计算机为{2}", b, a);
                if (a == b)
                {
                    Console.WriteLine(" 平局  ");
                    c = c + 1;
                }
                else if ((a == 1 && b == 2) || (a == 2 && b == 3) || (a == 3 && b == 1))
                {
                    Console.WriteLine("你输了");
                    d = d + 1;
                }
                else
                {
                    Console.WriteLine("你赢了");
                    e = e + 1;
                }
                Console.WriteLine("不玩时请输入5");
                b = Convert.ToInt32(Console.ReadLine());
                if (b == 5)
                {
                    int f = c + d + e;
                    Console.WriteLine("共玩{0}  为胜局为{1}   平局为{2}   负局为{3}", f, e, c, d);
                }
            }

北大青鸟 Java 指导学习。

 int b = 0;
            for (int i = 0; b != 5; i++)
            {
                // 计算机出拳
                int a, c = 0, d = 0, e = 0;
                Random r = new Random();
                a = r.Next(1, 3);
                Console.WriteLine("请出拳：其中1代表拳头；2代表剪刀；3代表布");
                b = Convert.ToInt32(Console.ReadLine());//这一句最好用ReadLine方法

                Console.WriteLine("你出拳为{0}  +  计算机为{1}", b, a);// 你的代码 是Console.WriteLine("你出拳为{1}  +  计算机为{2}", b, a);//
                if (a == b)
                {
                    Console.WriteLine(" 平局  ");
                    c = c + 1;
                }
                else if ((a == 1 && b == 2) || (a == 2 && b == 3) || (a == 3 && b == 1))
                {
                    Console.WriteLine("你输了");
                    d = d + 1;
                }
                else
                {
                    Console.WriteLine("你赢了");
                    e = e + 1;
                }
                Console.WriteLine("不玩时请输入5");
                b = Convert.ToInt32(Console.ReadLine());
                if (b == 5)
                {
                    int f = c + d + e;
                    Console.WriteLine("共玩{0}  为胜局为{1}   平局为{2}   负局为{3}", f, e, c, d);
                }
            } 

测试结果有问题：
当第一次输入5时，系统默认是“拳”
当第二次输入5时，输出：共玩{0}  为胜局为{1}   平局为{2}   负局为{3}，立即关闭控制台，来不及看见，
这是什么原因？

static void Main(string[] args)
        {
            int b = 0;
            int a, c = 0, d = 0, e = 0;
           
            for (int i = 0; b != 5; i++)
            {
                // 计算机出拳
                Console.WriteLine("请出拳：其中1代表拳头；2代表剪刀；3代表布；5代表退出！");
                b = Convert.ToInt32(Console.ReadLine());//这一句最好用ReadLine方法
                Random r = new Random();
                a = r.Next(1, 3);
                if (b == 5)
                {
                    int f = c + d + e;
                    Console.WriteLine("*******************************************************************************");
                    Console.WriteLine("共玩{0}  为胜局为{1}   平局为{2}   负局为{3}", f, e, c, d);
                    break;
                }
                else if (b != 1 && b != 2 && b != 3 )
                {
                    Console.WriteLine("********输入错误，请重新输入************");
                }
                else
                {
                    Console.Write("你出拳{0}<--->计算机出拳{1}", b, a);// 你的代码 是Console.WriteLine("你出拳为{1}  +  计算机为{2}", b, a);//
                   
                    if (a == b)
                    {
                        Console.WriteLine("  结果：平局  ");
                        c = c + 1;
                    }
                    else if ((a == 1 && b == 2) || (a == 2 && b == 3) || (a == 3 && b == 1))
                    {
                        Console.WriteLine("  结果：你输了");
                        d = d + 1;
                    }
                    else
                    {
                        Console.WriteLine("  结果：你赢了");
                        e = e + 1;
                    }
                }
                Console.WriteLine();               
            }       
            Console.ReadKey();
        }

static void Main(string[] args)
        {
            int b = 0;
            int a, c = 0, d = 0, e = 0;
           
            for (int i = 0; b != 5; i++)
            {
                // 计算机出拳
                Console.WriteLine("请出拳：其中1代表拳头；2代表剪刀；3代表布；5代表退出！");
                b = Convert.ToInt32(Console.ReadLine());//这一句最好用ReadLine方法
                Random r = new Random();
                a = r.Next(1, 3);
                if (b == 5)
                {
                    int f = c + d + e;
                    Console.WriteLine("*******************************************************************************");
                    Console.WriteLine("共玩{0}  为胜局为{1}   平局为{2}   负局为{3}", f, e, c, d);
                    break;
                }
                else if (b != 1 && b != 2 && b != 3 )
                {
                    Console.WriteLine("********输入错误，请重新输入************");
                }
                else
                {
                    Console.Write("你出拳{0}<--->计算机出拳{1}", b, a);// 你的代码 是Console.WriteLine("你出拳为{1}  +  计算机为{2}", b, a);//
                  
                    if (a == b)
                    {
                        Console.WriteLine("  结果：平局  ");
                        c = c + 1;
                    }
                    else if ((a == 1 && b == 2) || (a == 2 && b == 3) || (a == 3 && b == 1))
                    {
                        Console.WriteLine("  结果：你输了");
                        d = d + 1;
                    }
                    else
                    {
                        Console.WriteLine("  结果：你赢了");
                        e = e + 1;
                    }
                }
                Console.WriteLine();               
            }      
            Console.ReadKey();
        }

谢谢
谢谢各位！！！！

你这程序这样运行起来时不会出现3的，应该把是b=r.Next(1,4)的吧

路过~~

UP~~~~