原创：用VC编写的计算器程序，可以计算任意精度的表达式结果。-Original: VC prepared to use calculator program, you can calculate the expression of the results of arbitrary precision.

一个用vc++实现的计算器原代码,是本人编写的第一个windows程序-A used vc++ realize calculator source code, is I write the first Windows programs