十进制转换模块采用了连减法，实现了二进制数向十进制数的转换；
BCD number conversion realizes the conversion from binary system to decimal system by consecutive subtractions.
阐述了带符号十进制数原码、补码位数的扩展和压缩方法，介绍了十进制补码的加法运算和减法运算。
The method of expansion and compression of the decimal numeral true form with symbol and ten's complement digit is introduced. And the addition and minus operations of ten's complement are introduced.
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