Student management system. Students enter its name. Provide query, add, delete,...

代码说明：

学生管理系统。输入学生学号，姓名。 提供查询，增加，删除，修改。功能差不多。一般的功能都有。不久前，做的实验。-Student management system. Students enter its name. Provide query, add, delete, modify. Function almost. General function. Not long ago, to do experiments.