设计一个学生成绩管理系统

?　　⑴有学号,姓名,班级,成绩字段

?　　⑵初始化一个班级(35人)的基本信息

?　　⑶统计60分以下,60～70,70～80,80～90,90分以上学生信息 按四个字段查询并列出学生信息

?　　⑷按学生成绩高到低,低到高进行排序.

-Students design a performance management system ? ⑴ a student number, name, class, performance field　? ⑵ initialize a class (35 people) of the basic information　? ⑶ Statistics 60 points or less, 60 ~ 70,70 ~ 80, 80 to 90,90 points or more student information　by four students in the field and lists the information query　? ⑷ by high to low student achievement, low to high order.