用C#模仿文曲星上的猜数字游戏

       文曲星上的猜数字游戏实现起来比较简单。下面这个例子中，生成number时用集合list提高效率，验证输入是否合法和验证结果正确用hashtable提高效率。相比用数组循环来说会好了很多。

      

private static Hashtable hstableCheckSame = new Hashtable();  //用来检查输入答案是否有重复的数字
        private static Hashtable hstableAnswer = new Hashtable();    //用来存放随机生成的结果
        private const int INT_TRY_TIMES = 10;

        public static Hashtable HstableAnswer
        ...{
            get ...{ return hstableAnswer; }
        }

        public static void Main(string[] args)
        ...{
            Console.WriteLine("***************** Game Guess Number ***************** ");
            Console.WriteLine("The result will be given in the way of "2A1B".");
            Console.WriteLine(""A" means the value and position both are correct.");
            Console.WriteLine(""B" means the value is correct but the position is not.");
            Console.WriteLine("You have total " + INT_TRY_TIMES + " times to guess the number.");
            Console.WriteLine(" ***************************************************** ");

            while (true)
            ...{
                Console.WriteLine("Enter "start" to begin the game or "end" to exit.");
                switch (Console.ReadLine().ToLower())
                ...{
                    case "start":
                        if (BeginGame() == false)
                        ...{
                            goto End;
                        }
                        break;
                    case "end":
                        goto End;
                    default:
                        break;
                }
            }

        End:
            Console.WriteLine(" *************  End  ****************");
        }

        private static bool BeginGame()
        ...{
            //随机生成一个结果
            string strAnswer = Generate();

            for (int i = 0; i < INT_TRY_TIMES; i++)
            ...{
                System.Console.Write("Please input your guess (or enter "end" to end the game):");
                string strInput = System.Console.ReadLine();

                //判断是否要退出游戏
                if (strInput.Trim().ToLower() == "end")
                ...{
                    return false;
                }

                //检查输入是否合法
                if (CheckValid(strInput) == false)
                ...{
                    i--;
                    continue;
                }

                //检查输入的答案是否正确
                if (CheckInput(strInput, strAnswer) == true)
                ...{
                    System.Console.WriteLine("  >>> Well done.Congratulations! ");
                    break;
                }
                else
                ...{
                    if (i >= INT_TRY_TIMES - 1)
                    ...{
                        System.Console.WriteLine("  >>> You lose.The answer is " + strAnswer + " ");
                    }
                    else
                    ...{
                        System.Console.WriteLine("    Chances left: " + (INT_TRY_TIMES - 1 - i) + ". Good luck!  ");
                    }
                }
            }

            return true;
        }

        private static string Generate()
        ...{
            string strNumberGenerated = string.Empty;

            //初始化数字列表
            List<string> numberList = new List<string>();
            for (int intNum = 0; intNum < 10; intNum++)
            ...{
                numberList.Add(intNum.ToString());
            }

            //随机生成一个结果
            Random random = new Random(DateTime.Now.Millisecond);
            hstableAnswer.Clear();
            for (int i = 0; i < 4; i++)
            ...{
                int intIndex = random.Next(numberList.Count);
                strNumberGenerated += numberList[intIndex];
                hstableAnswer.Add(numberList[intIndex], numberList[intIndex]); //添加到hashtable
                numberList.RemoveAt(intIndex);
            }

            return strNumberGenerated;
        }

        private static bool CheckInput(string strInput, string strAnswer)
        ...{
            int intValuePosition = 0;  //数值和所处位置都正确的数字个数
            int intValue = 0;    //数值正确但是所处位置不正确的数字个数

            for (int i = 0; i < 4; i++)
            ...{
                if (strInput[i] == strAnswer[i])
                ...{
                    //数值和所处位置都正确
                    intValuePosition++;
                }
                else
                ...{
                    //数值正确但是所处位置不正确
                    if (hstableAnswer[strInput[i].ToString()] != null)
                    ...{
                        intValue++;
                    }
                }
            }

            //输出判断结果
            System.Console.WriteLine("    Result : " + intValuePosition + "A" + intValue + "B");

            if (intValuePosition >= 4)
            ...{
                return true;
            }

            return false;
        }

        private static bool CheckValid(string strInput)
        ...{
            //检查输入的长度是否合法
            if (strInput.Trim().Length != 4)
            ...{
                System.Console.WriteLine("  Input Error:Please input 4 digits. ");
                return false;
            }

            //检查输入是否数字
            try
            ...{
                int.Parse(strInput);
            }
            catch
            ...{
                System.Console.WriteLine("  Input Error:Only digits allowed. ");
                return false;
            }

            //检查是否有重复的数字
            hstableCheckSame.Clear();
            for (int i = 0; i < strInput.Length; i++)
            ...{
                if (hstableCheckSame[strInput[i]] == null)
                ...{
                    hstableCheckSame.Add(strInput[i], strInput[i]);
                }
                else
                ...{
                    System.Console.WriteLine("  Input Error:Each digit can only be used once");
                    return false;
                }
            }

            return true;
        }