使用turbo C写的多级菜单程序，主要用了函数指针，使程序简洁易懂，容易管理-use of written procedures for multi-level menu, the main function of the target process, easy to read, easy to manage

实现类似Turbo C的用户界面，绝对原创-Turbo C to achieve a similar user interface, an absolute original