It varies from decimal in that precision decimal Numbers carry not only a numeric value but also an arithmetic precision that is retained.
它与decimal不同，因为精度十进制数不仅包含一个数字值，而且保留了一个算法精度。
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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