unsigned char a = 0x02;
  

  unsigned char b = 0xa0;
  

  unsigned int baiwei = 0;//用于保存b的BCD码的百位
  

  unsigned int shiwei = 0;//用于保存b的BCD码的十位
  

  unsigned int gewei = 0;//用于保存b的BCD码的个位
  

  unsigned int c = 0;//用于保存BCD码
  

  baiwei = b / 100;
  

  shiwei = (b % 100) / 10;
  

  gewei = b % 10;
  

  c = (baiwei << 16) + (shiwei << 8) + gewei;