实际的计算器模拟.首先创建一个基于对话框的工程。编辑对话框，形成计算器的界面。然后为编辑框添加一个字符型变量，给按钮添加连接代码，使其实现计算器的功能。-Practical computer simulation. First create a dialog based engineering. The editor dialog box, form a calculator interface. Then as the edit box to add a character variable,