输入学生的学号、数学成绩、英语成绩、物理成绩、运行后得到总成绩并从高到低排名，且算出平均分；加入查找功能，输入学号后，显示学生成绩。-Enter the student s student number, math scores, English grades, physical results, after running to get the total score and high to low ranking, and calculate the average score join