这是用MFC做的一个小型计算器，能实现普通的计算。-This is done with a small calculator MFC, to achieve common calculations.

用MFC实现二维的树，里面含有不同的计算规则和绘制方法 根据用户的选择绘制出不同的效果-MFC achieved by two-dimensional tree, which contains the rules and draw different calculation methods based on the user' s choice to draw the different effects

实现计算器的计算功能，简单有效。对初学MFC有较大的参考意义-The calculation function calculator, simple and effective. Beginner MFC reference