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References:	<dd5e98ea-8f39-1c4b-116c-37968cb3a52d AT cornell DOT edu>
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Reply-To:	dank AT kegel DOT com
From:	Dan Kegel <dank AT kegel DOT com>
Date:	Sat, 07 Apr 2018 20:52:01 +0000
Message-ID:	<CAPF-yOboiR8Dg+QtrHCCR55vPGysMxQ=Wbpa4QGaJ=i5PoqtkQ@mail.gmail.com>
Subject:	Re: Floating point exception in strtod()
To:	cygwin AT cygwin DOT com
X-IsSubscribed:	yes

Is that 19! ?  Probably doesn't fit precisely into a double.  Does strtold
behave better?

Some implementations throw on unrepresentable numbers, e.g.
https://docs.oracle.com/cd/E19253-01/816-5168/6mbb3hrte/index.html

Ken Brown <kbrown AT cornell DOT edu> schrieb am Sa., 7. Apr. 2018, 10:40:

> $ 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.  */
>    const char *str = "121645100408832000.0";
>    char *ptr;
>
>    feenableexcept (FE_INVALID);
>    strtod (str, &ptr);
>
>    /* If there was an exception, the following will not get executed.  */
>    printf ("No exception.\n");
> }
>
> $ gcc strtod_test.c
>
> $ ./a
> Floating point exception (core dumped)
>
> [The above was on x86.  On x86_64 there's simply no output.]
>
> I have no idea what's special about the number 121645100408832000.0, but
> the problem goes away if, for example, I replace the leading 1 by 2.
>
> Ken
>
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