用C语言编写一程序，读入全班的成绩并存入一文件中,计算、存储并输出成绩排名、平均成绩与均方差，查询某个学生的成绩与排名。-A program written in C, and read the results into a class file, computing, storage and output performance ranking, grade point average and standard deviation, a student query results and ra