Re: [Mingw-w64-public] strtod and 'nan' and 'inf' strings

[Kai T. <kti...@go...>]

2010/11/1 Sisyphus <sis...@op...>:
> Hi,
>
> The demo:
>
> ##############################
> #include <stdio.h>
> #include <stdlib.h>
>
> int main(void) {
>    double x;
>    char * ptr;
>
>    x = strtod("nan", &ptr);
>    printf("%f\n", x);
>
>    x = strtod("INf", &ptr);
>    printf("%f\n", x);
>
>    return 0;
> }
> ##############################
>
> With the mingw.org compilers that I've tested, the output of that program
> is:
>
> -1.#IND00
> 1.#INF00
>
> But, on the same machine, with the mingw64 compilers that I've tested, the
> output is:
>
> 0.000000
> 0.000000
>
> Why the difference ?
>
> Cheers,
> Rob

Hi Rob,

the difference is that we are exporting for strtod the msvcrt function
and do not redirect to the internal c99 version of __strtod. If you
use here __strtod instead, you will get c99 compatible behavior.

Regards,
Kai

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