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#include <reg51.h> #define uchar unsigned char sbit key=P1^0; uchar i,j;   xianshima[3]={0xc0,0xf9,0xa4};   void delay ( i ) {      while  (i--); }   void main() { j=0; while(1)   {      if(key==0)      {       delay(1000);       P2=xianshima[j];       j=j+1;       while(key==0) ;       }    } }