说明：  本文需要你事先了解面向对象的基于消息驱动的 Windows 消息编程，当然，对于编写这个计算器，你不必知道太多的windows编程，你重要会编写基于对话框的简单应用程序就可以了。　　首先，让我们来仔细了解一下mircosoft的计算器吧，我们发现它是一个基于对话框的含有两的主对话框、一个关于对话框、一个菜单的应用程序。也就是说，我们应该创建一个基于对话框的应用程序，并且为其添加一个菜单和一个主对话框（因为，应用程序已经创建好了一个主对话框和关于对话框）。
(paper you need to advance understanding of the object-oriented message-driven programming Windows news, of course, For the preparation of this calculator, you do not need to know too many windows programming, You will be important to prepare a simple dialog-based applications on it. First of all, let us know in detail what the calculator mircosoft bar, We found that it is based on a dialog box containing two of the main dialog, a dialog on, a menu of applications. In other words, we should create a dialog-based applications, and for adding a main menu and a dialog box (because, Application procedures have been well-established and one of the main dialog box).)