1)能够从屏幕上读取一个学生的信息并将信息存入到数据文件中。 2)能够将指定的信息从文件中删除。 3)能够按编号、姓名对学生的信息进行检索并将检索结果显示在屏幕上。 4)可以统计全部学生的总成绩，及其在班上的排名。 5)能够统计各科的平均成绩及及格率。 6)要求有错误提示功能，例如性别只能输入男女，输入错误提示重新输入。 7)如果检索不到相应的信息应提示用户。-1) to read from the screen of a student information and information into the data file. 2) can be designated information deleted from the document. 3) to by number, name of student information retrieval and search results displayed on the screen. 4) Statistical all students can be a total score, and the class rankings. 5) Statistics Branch to the average scores and passing rates. 6) require a functional errors, such as sex between men and women can only import, import errors to re-enter. 7) If less than the corresponding retrieval of information should prompt the user.