简易计算器，主要有以下5个功能模块，（1）计算器界面显示模块。计算器界面显示必须在执行实际计算操纵之前完成，在这里主要调用了C语言图形系统函数和字符屏幕处理函数画出类似windows自带的计算器界面（2）计算器按键控制模块。（3）计算器计算处理模块，主要完成双目四则运算和单目运算操作。（4）计算器记忆处理模块，使计算器具有记忆功能。（5）计算器退出系统模块。-Simple calculator, mainly in the following five functional modules, (1) calculator interface module. Calculator screen to be manipulated in the implementation of the actual calculation to complete, where the main language to call the C function and character graphics system to deal with the screen to draw a similar function built-in calculator windows interface (2) calculator button control module. (3) calculator processing module, the main four complete binocular and monocular computing computing operation. (4) calculator memory module, so that a calculator with memory function. (5) calculator from the system module.