Fork#39763: different approximation of float in Wind and in Linux
Open Date: 2019-11-14 22:43
Last Update: 2019-11-15 14:28
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/39763
RSS feed for this Ticket:
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Last Changes/Comment on this Ticket:
2019-11-15 14:28 Updated by: keith
* Status Update from Open to Closed
* Resolution Update from None to Invalid
Comment:
Hello Claus,
I have three comments:
• Firstly, this is neither a bug report, nor a feature request; it is a
support request, (for which use of this ticket system is not appropriate);
as such it should have been directed to the mailing list, where it would
attain better exposure, and have a greater chance of attracting a fruitful
discussion, (which it will not achieve here).
• Secondly, the compiler you are using is badged as a TDM release, which is
not a genuine MinGW.org product. Indeed, the TDM distributor is not
authorized to use the MinGW trademark, so describing the TDM product as
"MinGW" is, technically, a trademark infringement.
• Finally, I've compiled your code fragment, (with addition of appropriate
header files, and wrapping it within a main function), using my genuine
(albeit experimental) MinGW build of GCC-9.2, (built as a Linux hosted
cross-compiler), with mingwrt-5.2.2 and w32api-5.2.2, and running under
Wine-4.18, I cannot reproduce your issue ... I see results of 25 in both
cases.
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Ticket Status:
Reporter: claus
Owner: (None)
Type: Issues
Status: Closed
Priority: 5 - Medium
MileStone: (None)
Component: GCC
Severity: 5 - Medium
Resolution: Invalid
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Ticket details:
Dear developers, when I run the following code:
int x=5; printf ("%d\n" , (int)pow(x,2)); printf ("%d\n" , (int)pow(5,2));
I get different results if working on: - Windows 7 and 10, gcc version: gcc
(tdm-1) 5.1.0 from last MinGW was the same some years ago with previous
versions: the results are 24 and 25; - Linux, many distro, many gcc versions:
the results are 25 and 25. To me, the Windows answer should be the same as the
first argument is int 5 in both cases. Could you please give a clarification. I
wasn't able to find any justification for my univ. students. Thank you in
advance
Claus
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