偶校验表的算法

#include
int main()
{
          unsigned char d, p;
          printf("EvenParityTable: \n");
          for(d=0;d<0x80;d++){
                      p = (d&0xf0)^(d<<4);
                      p = (p&0xc0)^(p<<2);
                      p = (p&0x80)^(p<<1);
                      printf("0x%x, ", d|p);
                      if((d&0x7)==0x7)
                      printf("\n");
        }
       return 0;
}