该程序段是学生信息管理系统的登录界面设计，用于区分用户的身份，使用户以自己的身份（管理员或学生）登录进入学生信息管理系统(This program segment is the login interface design of the student information management system, which is used to distinguish the identity of the user and enable the user to login into the student information management system as his own identity (administrator or student).)