每一条记录包括一个学生的学号、姓名、3门课成绩、平均成绩。



输入功能：可以一次完成若干条记录的输入。



显示功能：完成全部学生记录的显示。



查找功能：完成按姓名查找学生记录，并显示。



排序功能：按学生平均成绩进行排序。



插入功能：按平均成绩高低插入一条学生记录。



学生记录存在文件score中。-Record each including a student' s study number, name, grade 3 class, the average score. Input function: can be a complete number of records input. Display features: Record all students to complete the display. Search functions: the completion of student records search by name, and displayed. Sort function: according to the average student score sort. Insert functions: according to the average grade level of students to insert a record. Record the students score in the documents exist.