一个简单计算器程序，实现两个操作数的运算，包括加减乘除-a simple calculator program, the two realize the number of computing operations, including the arithmetic

基于STM32上UCOS II的GUI的实例，GUI实现了图形界面的加减乘除的运算，已经在STM32F103的单板上运行成功!-GUI-based UCOS II of the STM32 instance, GUI graphical interface to achieve a subtraction, multiplication and division operations, has been successfully run on the board in the STM32F103