用与非门实现下列代码转换:(1)8421码转换为余3码;(2)8421码转换为2421码;(3)余3码转换为余3格雷码。其代码转换表如表所示。
十进制数8421码余3码2421码余3格雷码00000001100000010100010100000101102001001010010011130011011000110101401000111010001005010110001011110060110100111001101701111010110111118100010111110111091001110011111010