说明：  巧用移位法进行数制转换：十进制BCD码转二进制数的流程图，二进制数转十进制BCD码的流程图，用的都是移位法！！请欣赏！！
(Using the shift number conversion method: binary decimal BCD code to switch the flow, turn binary decimal BCD code flow chart, the shift method is used! ! Please enjoy! !)