根据设计，贪吃蛇这个程序一共实现如下几个功能，包括登录模块、初始模块、方向模块、退出模块、暂停/继续模块、其他模块等。-By design, the program altogether Snake achieve the following several functions, including the login module, the initial module, the direction of the module, the exit module, pause/resume mo