这是一个有关复数的小程序，通过此程序，朋友们可以更好的理解C++的面向对象功能，比如说类的继承，类的重载，以及虚基类的使用。-This is a small complex procedures, the adoption of this procedure, friends can be a better understanding of C++ Object-oriented features, such as class inheritance, kind of heavy-duty, as well as the use of virtual base class.