用C语言写一个基于单片机89c51的计算器程序，p1口为4*4键盘，P0口控制共阴数码管！

include //包含头文件 #define uchar unsigned char #define uint unsigned int unsigned char const dofly[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};//0-F，数码管来显示按下键的值。 uchar keyscan(void); /