MD5实用源码，可用于读取硬盘系列号后，用MD5加密一下生成机器码提供给使用者-MD5 utility source can be used to read hard disk serial number, the use of MD5 encryption to generate binary look to provide to users

教师用的学生成绩登记系统，可添加删除修改学生成绩，或大批量修改成绩，还可以现实学生信息，按成绩排名。- save the data to the hard disk，create the information of the students，display the information of the students，search for the students according to their ID number or name,add or remove the informati