Glenn Fowler wrote:
> On Mon, 13 Nov 2006 05:30:49 +0100 Roland Mainz wrote:
> > Don Cragun wrote:
[snip]
> > Mhhh, I am just wondering why HUGEVAL is treated slightly differently.
>
> > The include "/usr/include/iso/math_c99.h" has the following section:
> > -- snip --
> > #if defined(_STDC_C99) || _XOPEN_SOURCE - 0 >= 600 ||
> > defined(__C99FEATURES__)
> > #if defined(__GNUC__)
> > #undef HUGE_VAL
> > #define HUGE_VAL (__builtin_huge_val())
> > #undef HUGE_VALF
> > #define HUGE_VALF (__builtin_huge_valf())
> > #undef HUGE_VALL
> > #define HUGE_VALL (__builtin_huge_vall())
> > #undef INFINITY
> > #define INFINITY (__builtin_inff())
> > #undef NAN
> > #define NAN (__builtin_nanf(""))
> > -- snip --
[snip]
>
> HUGE_VAL is +Inf on systems supporting IEEE Std 754-1985 and some
> "huge" value denoting error on other systems
>
> ksh arithmetic supports Inf on all systems
> so there's no need for { HUGE_VAL HUGE_VALF HUGE_VALL }
Mhhh... why does "/usr/include/iso/math_c99.h" then define |HUGE_VAL*|
seperately, followed by |INFINITY| ?
----
Bye,
Roland
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