学生的记录由学号和成绩组成，N名学生的数据已在主函数中放入结构体数组s中，请编写函数fun()，它的功能是按分数的高低排列学生的记录，低分在前。-Record number of students learning and achievement by the composition, N-student data has been placed in the main function of the structure array s, write a function fun (), its function is arranged according to the level of student scores a record low score in the former.