程序设置了三个级别的帐户：







一 超级管理员帐户 ：ID:admin passwd:admin 拥有对老师学生的所有操作。









二 老师帐户：帐号密码由文件读取，修改删除由管理员控制。拥有对学生的修改成绩 录入成绩，



修改学生的成绩。查看统计成绩信息。修改更新自己的信息。









三 学生帐户 ：对自己的信息的更新修改！ 查看自己的成绩信息！







管理员账号密码静态3次错误输出会推出系统 教师账号密码由管理员创建存在teacher.dat里面



学生账号密码也有管理员初始创建存在student.dat里面。



学生和教师在登录时首先检查账号是否存在。存在后输入密码，在密码错误三次后。退出！







本系统在系统运行时读入文件。在需要修改的时候时刻保存和更新排名。当修改不被保存的时候会从文件再次读入！-The program set up three levels of account:







A super administrator account: ID: admin passwd: admin has all the operations of the teacher students.









Two teacher Account: Username Password file read, modify, delete controlled by the administrator. Have students modify results entry scores,



Modify student achievement. View statistical results information. Modify update their information.









Three students account: modify the update of the information! View results!







System administrator account password 3 times a static error output will be introduced teachers account password by the administrator create exist teacher.dat inside



Student account password the the administrator initially created there is student.dat inside.



Students and teachers in login first check whether the account exists. Exist, enter your password in the wrong password three times. Exit!







Read a file in the system when the system is running. Need to be modified when the time to