用MFC编写的一个小计算器的文件，它包括小数点以及加减乘除开平方平方的功能，适合初学者下载，是大学二年级的内容练习题，MFC 具有很方便的编写对话框的功能-Written with the MFC document a small calculator, which includes the square root of the decimal point and the Math function of the square, suitable for beginners to downloa