Floating point exception in strtod()
Eliot Moss
moss@cs.umass.edu
Sat Apr 7 20:56:00 GMT 2018
On 4/7/2018 1:40 PM, Ken Brown wrote:
> $ cat strtod_test.c
> #include <stdio.h>
> #include <stdlib.h>
> #include <fenv.h>
>
> int
> main ()
> {
>  /* The following number comes from /usr/share/asymptote/ode.asy. */
> Â const char *str = "121645100408832000.0";
> Â char *ptr;
>
> Â feenableexcept (FE_INVALID);
> Â strtod (str, &ptr);
>
>  /* If there was an exception, the following will not get executed. */
> Â printf ("No exception.\n");
> }
If I do the same thing WITHOUT the feenableexcept, it works fine.
Perhaps strtod catches an exception and then applies a different
method in some cases, or perhaps it wants exceptions off and
deals with things its own way.
If I include the feenableexcept, I get the same behavior you
reported (in 32-bit; I did not test 64-bit).
Regards - Eliot Moss
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