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From: analyst41 on 17 Jul 2010 09:42
In a**b are there any restrictions on the data types of a and b - or
will the language handle all numeric cases?

Thanks.




From: m_b_metcalf on 17 Jul 2010 10:37
On Jul 17, 3:42 pm, "analys...(a)hotmail.com" <analys...(a)hotmail.com>
wrote:
> In a**b are there any restrictions on the data types of a and b - or
> will the language handle all numeric cases?
>
> Thanks.

All combinations of intrinsic numeric types are permitted (MR&C, Table
3.2) but you cannot raise a negative real value to a real power.

Regards,

Mike Metcalf
From: Phillip Helbig---undress to reply on 17 Jul 2010 11:08
In article
<83d9c160-d7f6-4c1b-9b4b-2e6fe7e68ccb(a)s9g2000yqd.googlegroups.com>,
m_b_metcalf <michaelmetcalf(a)compuserve.com> writes:

> On Jul 17, 3:42=A0pm, "analys...(a)hotmail.com" <analys...(a)hotmail.com>
> wrote:
> > In a**b are there any restrictions on the data types of a and b - or
> > will the language handle all numeric cases?
> >
> > Thanks.
>
> All combinations of intrinsic numeric types are permitted (MR&C, Table
> 3.2) but you cannot raise a negative real value to a real power.

$ create test.f90
print*, (-1.0)**2.0
end
Exit
$ foro test
$ link test
$ r test
1.000000

The "foro" symbol includes "/STANDARD=F95/WARNINGS=ALL".

What am I missing?

From: steve on 17 Jul 2010 11:16
On Jul 17, 8:08 am, hel...(a)astro.multiCLOTHESvax.de (Phillip Helbig---
undress to reply) wrote:
> In article
> <83d9c160-d7f6-4c1b-9b4b-2e6fe7e68...(a)s9g2000yqd.googlegroups.com>,
>
> m_b_metcalf <michaelmetc...(a)compuserve.com> writes:
> > On Jul 17, 3:42=A0pm, "analys...(a)hotmail.com" <analys...(a)hotmail.com>
> > wrote:
> > > In a**b are there any restrictions on the data types of a and b - or
> > > will the language handle all numeric cases?
>
> > > Thanks.
>
> > All combinations of intrinsic numeric types are permitted (MR&C, Table
> > 3.2) but you cannot raise a negative real value to a real power.
>
> $  create test.f90
> print*, (-1.0)**2.0
> end
>  Exit
> $  foro test
> $  link test
> $  r test
>   1.000000
>
> The "foro" symbol includes "/STANDARD=F95/WARNINGS=ALL".
>
> What am I missing?

A descent compiler?

laptop:kargl[203] gfc4x -o z a.f90
a.f90:1.9:

print*, (-1.0)**2.0
1
Error: Raising a negative REAL at (1) to a REAL power is prohibited

--
steve
From: glen herrmannsfeldt on 17 Jul 2010 11:47
analyst41(a)hotmail.com <analyst41(a)hotmail.com> wrote:

> In a**b are there any restrictions on the data types of a and b - or
> will the language handle all numeric cases?

Now I believe all numeric types are allowed.

Fortran 66 didn't allow complex powers. I am not sure when that
restriction was removed.

-- glen
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