说明：   本人刚开始接触单片机 试着编写了一个可以加减乘除的计算器 可以算小数的哦 希望这东东对我们这些新手有帮助 还请高手指点指点
(I just started trying to contact single-chip can be prepared a calculation of the calculator can count decimal Dongdong Oh hope that those of us novices have also requested the expert advice to help instruct)