学生成绩管理系统，程序主要处理学生的学号、姓名、和学科成绩（在程序中以语文、数学、英语三科为例）。本程序主要实现了学生成绩的输入、显示、查询、添加、删除、排序、保存、统计、从文件中读入这九个功能。-Program mainly deal with the student s student id, name, and the discipline result (in a program in sorted into Chinese, maths, English, for example). This program mainly implements the student achievement of the input, display, query, add, delete, sorting, preservation, statistics, reading these nine functions　a file.