//根据学生平均成绩来排序
student_list* order(student_list* head)
{
student_list* p;
int i = 1;
p = head->next;
int n1 = 1;
while (p != NULL)
{
p->order = i;
i++;
p = p->next;
//printf("order\n");
}
return head;
}