建立一个学生成绩信息的单向链表，信息包括学号、姓名、成绩，学生记录按学号 由小到大顺序排列，要求实现对成绩信息的插入、修改、删除和遍历操作。-Student achievement information to establish a one-way linked list, information including student number, name, score, record student numbers by school Small to large order,