简单计算器,基于mfc的简单计算器，适合新手了解mfc-A simple calculator, simple calculator based on mfc suitable for the novice to understand mfc

MFC简单计算器，能进行简单的四则运算。-MFC simple calculator that can perform simple four operations.

带符号的MFC大整数计算器，能进行简单运算，而且能进行带符号的大整数运算-MFC large unsigned integer calculator that can perform simple arithmetic, but also to carry out a large unsigned integer arithmetic