关于结构体应用的 c++程序，程序要求：从键盘输入5个学生的姓名、3门课的成绩，原数据显示；（2）计算3门课总平均成绩；（3）按总平均成绩的高低依次显示各学生的信息-Application on the structure of the c++ program, the program requirements: 5 students from the keyboard' s name, 3 course results, the original data　(2) Calculate the class average score 3　(3) The average level of achievement information on each student in turn show