计算器,实现四则混合运算，带括号，带小数，小程序，c语言实现。-Calculator, to achieve four hybrid operation, with brackets, with a decimal, a small program, c language.

在arm嵌入式环境下设计的触摸屏的计算器，设计了触屏界面，实现基本运算，包括小数运算和平方根运算-Arm embedded in the environment designed touch screen calculator, designed touch screen interface to achieve the basic operations, including the small number of operations and square root operations