Hi.  Vincent.

The hard part of Banker's Rounding function is to determine if the fractional part is *exactly* 0.5. Thus, to use ceil and floor , one way (for the positive case) is adding 0.5 to a double value, then judge whether the floor of result number equals to the ceil of result number.  And  equaty comparison could not avoid incurring
inaccuracy, which is not what I want .Dealing with the bit pattern may looks odd, but it is correct.
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Regards,
Zhan Jianyu

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