这里提供一套C++的point定义类,里面有丰富的成员函数,全部通过验证。同时也望朋友们对其进行扩充和改进，我的联系地址为 yxding@gmail.com-Here to provide a C++ The point defined class, which has a wealth of member functions, all validated. At the same time also looking to expand their friends and improve m