文曲星猜数游戏的非TDD实现

懒人王的TDD by example (1) -- 挑战让我想起了多年前抱着文曲星猜数的时光，逝者如斯夫……

我本人一直认为TDD是个很玄妙的东西，它对我们习惯的功能驱动的编程方式是一种颠覆。我一直想实践一下，但是没有机会。希望能够从懒人王的这个系列里学到想学的东西。

在此先实现一个非TDD的实现，回头再比较一下与TDD的方式有什么不同。

由于时间仓促，没有过多的OO。整个代码只有一个Game类。

namespace GuessGame
{
    class Game
    {
        private static readonly int NUMBER_COUNT = 4;

        private static readonly int GUESS_TIME = 6;

        private int guessedTime;

        private int[] numbers;

        private int[] inputs;

        private int aCount;

        private int bCount;

        public Game()
        {
            Init();
        }

        public void Play(string input)
        {
            Input(input);
            if (!Compare())
            {
                Output();
                aCount = 0;
                bCount = 0;
                guessedTime++;
            }
            else
            {
                Console.Write("猜对了，正确答案为");
                Output(numbers);
                Console.WriteLine();
                Init();
            }
            if (guessedTime >= GUESS_TIME)
            {
                Console.Write("失败：您已经猜了" + guessedTime + "次");
                Init();
            }
        }

        private void Init()
        {
            aCount = 0;
            bCount = 0;
            guessedTime = 0;
            numbers = new int[NUMBER_COUNT];
            GenerateDistinctRandomNumbers();
            Console.WriteLine("请输入4位数字");
        }

        private void GenerateDistinctRandomNumbers()
        { 
            Random r = new Random();
            bool allowZero = true;
            for (int i = 0; i < NUMBER_COUNT; i++)
            {
                int n = r.Next(10);
                if (n == 0 && allowZero)
                {
                    numbers[i] = n;
                    allowZero = false;
                }
                else
                {
                    while (numbers.Contains(n))
                    {
                        n = r.Next(10);
                    }
                    numbers[i] = n;
                }
            }
        }

        private void Output()
        {
            Output(inputs);
            Console.Write("    ");
            Console.Write(aCount);
            Console.Write("A");
            Console.Write(bCount);
            Console.Write("B");
            Console.WriteLine();
        }

        private void Output(int[] array)
        {
            foreach (int i in array)
                Console.Write(i);
        }

        private bool Compare()
        {
            for (int i = 0; i < NUMBER_COUNT; i++)
            {
                if (numbers[i] == inputs[i])
                {
                    aCount++;
                }
                else if (numbers.Contains<int>(inputs[i]))
                {
                    bCount++;
                }
            }
            return aCount == NUMBER_COUNT;
        }

        private void Input(string input)
        {
            if (String.IsNullOrEmpty(input))
                throw new ArgumentNullException("输入不正确，重新输入");
            if (input.Length != NUMBER_COUNT)
                throw new ArgumentOutOfRangeException("输入不正确，重新输入");
            bool allowZero = true;
            inputs = new int[NUMBER_COUNT];
            for (int i = 0; i < input.Length; i++)
            {
                int n = 0;
                bool isInt = int.TryParse(input[i].ToString(), out n);
                if (isInt)
                {
                    if (n == 0 && allowZero)
                    {
                        allowZero = false;
                    }
                    else
                    {
                        if (inputs.Contains<int>(n))
                        {
                            throw new ArgumentException("输入不正确，重新输入");
                        }
                    }
                    inputs[i] = n;
                }
                else
                    throw new ArgumentException("输入不正确，重新输入");
            }
        }
    }
}

main方法很简单。

namespace GuessGame
{
    class Program
    {
        static void Main(string[] args)
        {
            Game game = new Game();
            while (true)
            {
                string input = Console.ReadLine();
                try
                {
                    game.Play(input);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
    }
}

好久不写代码，手有点生锈。

好了，请懒人拍砖。