编写一个程序，输入若干个学生姓名、英语、计算机和中文成绩，并求出平均成绩。（提示：设计一个英语成绩管理类English，一个计算机成绩管理类Computer和一个中文成绩管理类Chinese，另设计一个学生类，由前三个类派生出来。）

-Write a program, enter the number of student names, English, computers, and Chinese achievements, and find the average. (Hint: to design a performance management in English classes English, a computer class performance management performance management Computer and a Chinese class Chinese, the other students to design a class derived from the first three classes.)