From: Bill Long
Sent: Thursday, January 12,
2006 9:48 AM
>robin wrote:
>>>Thanks . It works now. But I thought all you do
here are 1) add
>>>implicit none 2) move function into the
program 3) use the word
>>>'contains'
>>In addition, you should use either "DOUBLE PRECISION" instead of
REAL*8
>>(which is not portable), or
>Well, using DOUBLE PRECISION as a replacement for real*8 is even
worse.
>It is likely to be wrong on at least some systems - the very definition
of not portable.
DOUBLE PRECISION gives double precision on every Fortran,
and by definition is fully portable.
On the other hand, real*8 is not portable.
>integer, parameter :: dp = selected_real_kind(1.0d0)
>will give a syntax error. I think you want something like:
I meant:
integer, parameter :: dp =
kind(1.0d0)
>>real (kind=dp) :: e
>with the revised definition of dp, this is the preferred portable
method.
Certainly is.
Another way is to write:
integer, parameter :: dp =
selected_real_kind(precision(1.0)+1)
