From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: getting same output as gfortran, long_float
Date: Fri, 1 May 2015 09:45:13 +0200
Date: 2015-05-01T09:45:13+02:00 [thread overview]
Message-ID: <142zdljlf0w57.1xh4g0wxv88y8.dlg@40tude.net> (raw)
In-Reply-To: mhva6b$t35$1@speranza.aioe.org
On Fri, 01 May 2015 02:32:27 -0500, Nasser M. Abbasi wrote:
> Actually, it is much more complicated. The way I wrote it
> above is not the optimal way. One is supposed to call
> SELECTED_REAL_KIND(n,e) requesting n significant digits
> and e number of digits in the exponent (e is optional).
Huh, they finally learned something after half of a century! (:-))
> i.e. one is supposed to write
>
> SELECTED_REAL_KIND(8,3) specifies real type of
> (+-) 0.xxxxxxxx * 10 ^(+-)xxx
>
> If the compiler does not support this, then the compile
> will fail. This is in a way similar to Ada's
>
> type my_type is digits n;
Yes, though Ada also mandates that for the precision specified, the
implementation must guarantee certain accuracy of operations. Maybe in the
following 50 years FORTRAN will get that idea as well.
> And it is supposed to be portable way of doing things, vs.
> using Real*16.
Actually REAL*16 is exactly portable. The problem addressed is not
portability, it is rather design being driven by requirements from the
problem space rather than from implementation specific aspects.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2015-05-01 7:45 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-30 21:17 getting same output as gfortran, long_float Nasser M. Abbasi
2015-04-30 22:08 ` Dmitry A. Kazakov
2015-04-30 22:11 ` Dmitry A. Kazakov
2015-04-30 22:37 ` Nasser M. Abbasi
2015-04-30 22:53 ` Nasser M. Abbasi
2015-05-01 7:22 ` Jacob Sparre Andersen
2015-05-01 1:12 ` Nasser M. Abbasi
2015-05-01 6:52 ` Dmitry A. Kazakov
2015-05-01 7:32 ` Nasser M. Abbasi
2015-05-01 7:45 ` Dmitry A. Kazakov [this message]
2015-05-04 0:15 ` robin.vowels
2015-05-04 7:21 ` Dmitry A. Kazakov
2015-05-04 8:53 ` robin.vowels
2015-05-04 10:18 ` Dmitry A. Kazakov
2015-05-04 13:45 ` robin.vowels
2015-05-04 14:47 ` Dmitry A. Kazakov
2015-05-07 2:01 ` robin.vowels
2015-05-01 23:24 ` Dennis Lee Bieber
2015-05-04 0:09 ` robin.vowels
2015-05-01 7:01 ` Dmitry A. Kazakov
2015-05-04 0:42 ` robin.vowels
2015-04-30 22:12 ` Jeffrey R. Carter
2015-04-30 22:27 ` Qun-Ying
2015-05-01 0:59 ` Dennis Lee Bieber
2015-04-30 22:32 ` Nasser M. Abbasi
2015-05-01 1:16 ` Jeffrey R. Carter
2015-05-01 1:40 ` Nasser M. Abbasi
2015-05-01 7:47 ` Jacob Sparre Andersen
2015-05-01 15:39 ` Waldek Hebisch
2015-05-01 17:27 ` Nasser M. Abbasi
2015-05-01 18:03 ` Nasser M. Abbasi
2015-05-04 0:51 ` robin.vowels
2015-05-04 0:47 ` robin.vowels
2015-05-01 8:21 ` Simon Wright
2015-05-01 11:55 ` Georg Bauhaus
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