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#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar num;
void main()
{
 TMOD=0x01;
 TH0=(65536-45872)/256;
 TL0=(65536-45872)%256;
 EA=1;
 ET0=1;
 TR0=1;
 P1=0xFF;
 while(1);
}
void T0_time() interrupt 1
{
               TH0=(65536-45872)/256;
               TL0=(65536-45872)%256;
               num++;
               if(num==20)
 {
               num=0;
               if(P1==0x00)
  {
              P1=0xFF;
  
  }
               else
               P1=P1>>1;
 }
}
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char** t;
main()
{
    char c[1];
    char** t1;
    sprintf(c,"%d",t);
    printf("t=%s---\n",c);
    if(strcmp(c,"0")!=0)
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