跪求一个at89c51单片机的c语言程序答:include <reg52.h> define uchar unsigned char define uint unsigned int sbit db=P2^7;char i,sec,min,h,date,month,year,flag;uchar j,k,m,n,o,p;sbit dula=P2^0;sbit wela1=P2^1;sbit wela2=P2^2;sbit key_ch=P3^5;sbit key_add=P3^6;sbit key_minus=P3^7;uchar code ...