MFC科学计算器功能的实现，vc++框架，按钮控件，编辑框-MFC to achieve scientific calculator function, c++ framework, control buttons, edit boxes

本程序将VC向导自动生成的矩形窗口框架,通过类的派生创建出一个非矩形的框架窗口(This program will VC wizard to automatically generate the rectangular window frame, by derived classes to create a non rectangular frame window)