从文本文件输入n个同学的姓名、性别、成绩，按成绩又高到底的顺序输出所有学生信息，分别求出男同学、女同学的平均成绩并输出。-From a text file input n students in the name, gender, achievement, merit-based and high in the end the order of the output information for all students, respectively, find the male student