菜单栏：文件（打开、保存、退出）/编辑（录入、删除、统计）/关于 界面：学生总人数、个人最高分、个人平均分、个人最低分、个人及格率、增加行、删除航、日历（各个按键都有提示信息）备注：./gridview即可运行，make编译-Menu bar: file (open, save, exit)/editor (entry, delete, statistics)/interface: the total number of students, the highest individual po