该程序是TICTACTOE游戏，棋盘为3*3，3个棋子连起来即为赢。输入参数时，若输入的数字超出边界或在已有棋子的地方再输入，则提示出错，要求重新输入。

1.2 课程设计要求

（1）将所需的数据和相应的函数封装在类中，改写程序使之结构化。

（2）将棋盘扩充成4*4的。

（3）统计输赢结果并打印输出。

（4）选做：使游戏更加生动。（输赢条件相同）-The program is a TICTACTOE game, the board is 3*3, the 3 pieces together that is to win. When the input parameters, if the input of the number than the border or in the place where there is a piece of re input, then prompted an error, the requirements of re input.

1.2 curriculum design requirements

(1) the required data and the corresponding functions are encapsulated in the class, and the program is structured to rewrite the program.

(2) to expand the board into 4*4.

(3) the statistical result and print output.

(4) choose to do: make the game more vivid. (or equal)