用protues仿真做的一个PIC单片机系统，主要功能是一个计算器，能实现整数的加减乘除运算。包含了PIC源程序，所用芯片是PIC16F887.-Protues simulation to do a PIC microcontroller system, the main feature is a calculator, to achieve integer addition and subtraction, multiplication and division. Contains the P