定义一个学生类Student，包含学生的学号，姓名，年龄，成绩等基本信息，将学生信息以一定的格式写入（建议用文本文件，便于检查）二进制文件student.dat中，实现对学生信息的显示，查询和删除等基本功能。实验中输入学生不少于5个。-The definition of a student-type Student, that contains students number, name, age, accomplishments and other basic information, information to the students to write a certain format (proposed text files, easy to check) student.dat binary file, the realization of student information display, query and delete such basic functions. Experimental type of not less than 5 students.