> On 30/12/2019 01:34, Tatsuo Ishii wrote: >> Hi, >> >> Can you please someone elaborate what's the meaning of "even" in >> datatype.sgml? >> >> <para> >> By default, floating point values are output in text form in their >> shortest precise decimal representation; the decimal value produced is >> closer to the true stored binary value than to any other value >> representable in the same binary precision. (However, the output value >> is >> currently never <emphasis>exactly</emphasis> midway between two >> representable values, in order to avoid a widespread bug where input >> routines do not properly respect the round-to-even rule.) This value >> will >> ~~~~~~~~~~~~~~~~~~~ >> use at most 17 significant decimal digits for <type>float8</type> >> values, and at most 9 digits for <type>float4</type> values. >> </para> >> >> I think "even" means "equality" here, not "even" of "even and odd". > > > It does actually mean "even and odd". This kind of rounding is also > called "Banker's Rounding". > > https://en.wikipedia.org/wiki/Rounding#Round_half_to_even
Oh, Thanks! The link is very helpful. -- Tatsuo Ishii SRA OSS, Inc. Japan English: http://www.sraoss.co.jp/index_en.php Japanese:http://www.sraoss.co.jp
