Introduction - If you have any usage issues, please Google them yourself
Create a dialog-based applications ex2. ⑴ Add three edit boxes, static text description 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.