On Sun, Apr 21, 2013 at 11:05 PM, Vincent Povirk madewokherd@gmail.com wrote:
The man page for modf claims it produces an exact fractional part: http://manpages.ubuntu.com/manpages/quantal/en/man3/modf.3.html
It's possible for modf to do this because the fractional part of a floating point number cannot require more precision than the original value.
So I think you've essentially just rewritten modf. My understanding is that floating point equality comparisons are exact, except in weird cases like NaN.
Oh, thanks for your tips, I will look at it.
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Regards, Zhan Jianyu