主要包括：主菜单、建立学生链表函数、显示学生链表函数、按学生学号查找信息函数、按学生姓名查找信息函数、按学号删除某个信息函数、按姓名删除某个信息函数、插入某个信...

代码说明：

主要包括：主菜单、建立学生链表函数、显示学生链表函数、按学生学号查找信息函数、按学生姓名查找信息函数、按学号删除某个信息函数、按姓名删除某个信息函数、插入某个信息函数、按降序分数排序输出信息函数、按降序分数排序输出信息函数-Include: the main menu, the establishment of student list function, display the students list function, in accordance with its students to find information function, the names of students to find information by function, according to study its function to delete a message, delete a message by name function, Insert an information function, sorted by descending scores output function, sorted by descending scores output function