Re: BAD BAD BUG: select round(3.5) results in 3 !!! - Sinisa Milivojevic - com.mysql.lists.win32

29 messages in com.mysql.lists.win32Re: BAD BAD BUG: select round(3.5) re...

From	Sent On	Attachments
Peter Holm	04 Apr 2001 19:12
David Peoples	04 Apr 2001 22:13
Ralph Mason	04 Apr 2001 22:48
René Tegel	04 Apr 2001 23:10
Sinisa Milivojevic	05 Apr 2001 03:55
David Patte	05 Apr 2001 04:05
Cynic	05 Apr 2001 04:17
Thimble Smith	05 Apr 2001 11:26
Ralph Mason	05 Apr 2001 13:00
Tim Endres	05 Apr 2001 13:32
Pete Harlan	05 Apr 2001 19:43
Jupiter wekwa Punungwe	06 Apr 2001 00:08
Luc Van der Veken	06 Apr 2001 01:36
Jupiter wekwa Punungwe	06 Apr 2001 06:49
Jupiter wekwa Punungwe	06 Apr 2001 07:19
Pete French	06 Apr 2001 07:52
Thimble Smith	06 Apr 2001 07:59
dpa...@relativedata.com	06 Apr 2001 08:05
Pete French	06 Apr 2001 08:58
René Tegel	06 Apr 2001 09:17
Tim Endres	06 Apr 2001 09:42
Pete French	06 Apr 2001 10:25
Tim Endres	06 Apr 2001 11:20
Luc Van der Veken	09 Apr 2001 01:55
Peter Holm	11 Apr 2001 09:12
René Tegel	11 Apr 2001 09:31
René Tegel	11 Apr 2001 09:34
René Tegel	12 Apr 2001 11:08
Luc Van der Veken	13 Apr 2001 00:53

Subject:	Re: BAD BAD BUG: select round(3.5) results in 3 !!!
From:	Sinisa Milivojevic (sin...@beotel.yu)
Date:	04/05/2001 03:55:20 AM
List:	com.mysql.lists.win32

René Tegel wrote:

reproducable on both NT4 and w2k (same version), however: linux even worse(!), since it rounds 1.5 to 2 and 2.5 to 2! oooooops:)

NT/W2K: mysql> select version(); +---------------+ | version() | +---------------+ | 3.23.32-debug | +---------------+ 1 row in set (0.00 sec)

mysql> select round(1.5), round(2.5); +------------+------------+ | round(1.5) | round(2.5) | +------------+------------+ | 1 | 2 | +------------+------------+ 1 row in set (0.00 sec)

Linux: mysql> select round(1.5), round(2.5); +------------+------------+ | round(1.5) | round(2.5) | +------------+------------+ | 2 | 2 | +------------+------------+ 1 row in set (0.04 sec)

mysql> select version(); +-------------+ | version() | +-------------+ | 3.23.36-log | +-------------+ 1 row in set (0.02 sec)

mysql>

----- Original Message ----- From: "Peter Holm" <PHo...@gmx.de> To: <win...@lists.mysql.com> Sent: Thursday, April 05, 2001 4:12 AM Subject: BAD BAD BUG: select round(3.5) results in 3 !!!

Hey yu windows guys, are you all sleeping???

Sorry for that bad news:

<LOUD> *** ON WIN32 MYSQL ROUNDS X.5 TO X (and not to X+1) *** </LOUD>

On linux everything works like expected.

Please do understand what this means: round is such a really basic function nobody expects not to work correctly - it means, we even have to test if select 1+1 results 2!

How can this be possible?

Sorry for being so snotty, I had a really bad week trying to understand some errors in my applications testing over and over again and I could not believe it when finding the reason - if you have to use a calculator to validate simple math functions you get snotty at some point...

Ok, we have the source and can check it out ourselves, right? ;)

Anyway, have a nice day

**** Do you sleep at night? (Alien Sex Fiend) **** (select wakeup from bad dream)

Hi!

We shall definitely take a look at the issue.

It could be a bug in OS's math lib, and even if it is so, we might put on our TODO to find a way to circumvent a problem.

Regards,