Well, the input to the sum must be the carry-in and the sum from adding the two input values.
如何做？好吧，给和的输入必须是输入进位和将两个输入相加的和。
The carry from bit3 to bit4 needed for adding packed binary coded decimal number correctly, where two binary coded decimal digits reside in one8-bit byte.
二进制编码的十进制数进行相加所需的从第3位到第4位的进位。
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