设计一个实用的小型学生成绩管理系统程序，它有输入、输出、插入、删除、查找、追加、读入、显示、保存、拷贝、排序、退出查询、检索和排序等功能，并且能够对指定文件操作，也可以将多个文件组成一个文件。-Design a practical small student achievement management system procedures, it has input, output, insert, delete, search, add, read, display, save, copy, sort, exit query, retri　and sorting functions, and can operate on the specified file, you can also file a file.