[Mingw-notify] [ mingw-Bugs-724385 ] strtold bug

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Bugs item #724385, was opened at 2003-04-19 21:49
Message generated for change (Comment added) made by jbannon
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Category: gcc
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Darrin Forelle (darrinf)
Assigned to: Danny Smith (dannysmith)
Summary: strtold bug

Initial Comment:
The following code produce wrong result:

#include <stdio.h>
#include <stdlib.h>

int main()
{
 char *strval = "0.876190625";
 printf("\%s\ -> %Lg", strval, strtold(strval, 0));

 return 0;
}

MinGW is v2.0.0 with runtime v2.4. The result is the 
same with gcc v3.2(mingw special 20020817-1) and 
v3.2.2(mingw special 20030208-1).

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Comment By: James Bannon (jbannon)
Date: 2003-04-22 18:57

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I tried it with double and it behaved as expected. I recognised 
it when it rounded to get rid of the 2 least-significant digits.

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Comment By: Luke Dunstan (infidel)
Date: 2003-04-22 02:15

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Recent versions of MinGW GCC use 80-bit long doubles and 
64-bit doubles, while MSVC and therefore the C runtime 
library use both 64-bit doubles and long doubles. The only 
way that your code will work is if MSVCRT printf is replaced 
with a version of printf that handles 80-bit long doubles. Until 
then, the workaround is to just use a double instead of a long 
double for displaying output.


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Comment By: James Bannon (jbannon)
Date: 2003-04-20 08:58

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James Bannon April 20, 2003

Tried it with both compiler sets and got the wrong results. The 
default Dev-C++ compiler also produced the same result. 
Tried it also with 0.0 and this was correct, but any other value 
seemed to be wildly inaccurate. Also tried the wchar_t 
versions with the same results. Tried changing the types to 
match the prototypes exactly but this made no difference. I 
haven't tried the Cygwin distribution as yet.

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