c语言版小型销售管理系统。在执行完修改过后，可以返回子目录，但是当选择退出子菜单返回主菜单时却直接退出程序，其他功能齐全。-c language version of small-scale sales management system. After modifications in the implementation of End to return to a subdirectory, but opted out when the sub-menu to return to the main menu directly from the program when other functions.