设计一个结构体数组来存放班级体学生成绩。结构体成员至少包括“学号”、“姓名”和至少三门功课名。由用户输入至少15个学生成绩信息，统计并输出各门功课的总分和平均分，输出各门功课的分数最大者和最小者，统计输出各门功课优秀人数（大于85分）和不及格人数。统计并输出各个学生的所有功课的总分和平均分。把用户输入的每个学生的信息写入文本文件-Design a structure array to store the class body of student achievement. Membership structure includes at least " Student Number" , " name"　and at least three lessons were. Input by the user at least 15 student achievement information, statistics and the output of all the subjects of the total score and average score, out of all the subjects of scores of maximum and minimum, statistical quality of all the subjects the number of output (more than 85 points) and non- pass number. Statistics and output all the homework each student the total score and average score. The user to enter information for each student to write a text file