设计一个学生类student,包括姓名和三门课程成绩，利用重载运算符将所有学生的成绩相加放在一个对象中，再对该对象求各门课程的平均分, 并编写完整的程序进-Design a student class student, including name and three course score, the use of overloaded operators will add the results of all students placed in an object, and then de