21 Apr
2013
21 Apr
'13
5:45 a.m.
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. --
Regards, Zhan Jianyu
Sent from cell phone. 在 2013-4-21 上午1:30，"Vincent Povirk" madewokherd@gmail.com写道：
Dealing with the bits of a floating point number directly is a bit odd, and it makes it hard to review the code. Is there a reason you don't want to use things like modf, floor, and ceil?