整个程序应包括几个大的模块，即游戏的围墙、蛇身、蛇的移动和食物的随机分布，每个模块又包含具体功能的实现。除了主体部分外，程序还包括游戏辅助说明部分和游戏难度选择功能的实现。-The entire program should include several large modules, namely game fences, snake, snake movement and random distribution of food, each module also contains the implementation of specific functions. In addition to the main part of the program also includes a game HELP section and the difficulty of the game choose to implement functions.