On Thu, Jun 30, 2005 at 09:44:57PM +0900, [EMAIL PROTECTED] wrote: > ::Dealing with integers illustrates the matter more clearly. When > ::the decimal value is exactly 0.5, then printf should round to the > ::nearest *even* integer, as far as I know, so you should get > > Hi Peter, > > Thank you for your explanation. I didn't know, until now, that > rounding should be done to the "nearest *even* integer". > Need to learn every day. ;-)
This is done to prevent systemic bias. However, note that http://www.opengroup.org/onlinepubs/009695399/functions/printf.html says: "The low-order digit shall be rounded in an implementation-defined manner." so while people have come to expect unbiased rounding, it isn't actually mandatory AIUI under vanilla SUSv3. Also see "What Every Computer Scientist Should Know About Floating-Point Arithmetic" at (among other places) http://docs.sun.com/source/806-3568/ncg_goldberg.html. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
