利用C++编写的学生成绩管理系统 可以进行学生成绩的添加修改查询等 类似于一个文库可收集大量学生的成绩信息 适用于作为C++初学者牛刀小试的范本-C++ written in student performance management systems can be added to modify query results as the C++ for beginners chopper model for small scale

simulink file of four quadrant operation of DC motor using chopper