(j3.2006) IEEE Exceptions Case Insensitive (Was:Signaling NaN)

[Craig Dedo]

Bill Long wrote:
> -----Original Message-----
> From: j3-bounces at j3-fortran.org [mailto:j3-bounces at j3-fortran.org] On Behalf Of
> Bill Long
> Sent: Friday, March 11, 2011 11:19
> To: fortran standards email list for J3
> Subject: Re: (j3.2006) Signaling NaN
> 
> The standard does specify some of this, and other parts are "processor
> dependent".
> 
	<snip>

> 
> Note that the standard (inconsistently) requires that on INPUT, the text
> is expected to be "NAN" and on output it is "NaN".  We print NAN on
> output so is consistent with input expectations.
> 
	<snip>
> 
> --
> Bill Long                                           longb at cray.com
> Fortran Technical Support    &                 voice: 651-605-9024
> Bioinformatics Software Development            fax:   651-605-9142
> Cray Inc./Cray Plaza, Suite 210/380 Jackson St./St. Paul, MN 55101
> 
> 
> _______________________________________________
> J3 mailing list
> J3 at j3-fortran.org
> http://j3-fortran.org/mailman/listinfo/j3

	Unfortunately, this statement is not completely correct.  Bill overlooks one important paragraph in the Fortran 2008 standard, 10.7.2.3.2p2:
A lower-case letter is equivalent to the corresponding upper-case letter in an IEEE exceptional specification or the exponent in a numeric input field.

Sincerely,
Craig T. Dedo
17130 W. Burleigh Place
P. O. Box 423                  Mobile Phone:  (414) 412-5869
Brookfield, WI   53008-0423    E-mail:  <craig at ctdedo.com>
USA
Linked-In:  http://www.linkedin.com/in/craigdedo