创建一个基于对话框的应用程序ex2。

⑴添加三个编辑框，用静态文本说明前两个编辑框用于输入计算数，第三个编辑框用于显示计算结果，并把第三个编辑框设为只读；

⑵添加四个按键按钮，标题分别为“加”、“减”、“乘”、“除”；

⑶分别为四个按钮添加消息响应函数，要求能实现当单击某个按钮时，在第三个编辑框中显示相应的计算结果。

-Create a dialog-based applications ex2. ⑴ Add three edit boxes, static text descr iption of the two previous calculations of the edit box for entering the third edit box to display results, and to a third edit box is set to read-only　⑵ Add four buttons button entitled " Canada" , " reduction" , " take" , " in addition"　 ⑶ are four buttons to add the message response function, required to achieve when you click a button, the edit box in the third shows the corresponding results.