Re: Is there a way in Fortran to designate an integer value as integer*8 ?

Steven G. Kargl wrote:

On Thu, 03 Oct 2024 14:45:31 +0200, R Daneel Olivaw wrote:
 

Lynn McGuire wrote:

I need many of my integers to be integer*8 in my port to 64 bit.  In
C/C++ code, I can say 123456L to mean a long long value, generally 64
bit.  Is there a corresponding way to do this in Fortran or am I stuck
with:
>
      call xyz (1)
>
      subroutine xyz (ivalue)
      integer*8 ivalue
      ...
      return end
>
must be:
>
      integer*8 ivalue
      ...
      ivalue = 1
      call xyz (ivalue)
>

>
This is not actually a Fortran issue as such, it's all about a specific
compiler (GNU Fortran).

 If we overlook the nonstandard type in the declaration, and agree
that the compiler will accept 'integer*8', then the program is
still invalid Fortran.  It's technically not a Fortran issue.  It
is a programmer issue.
 

Take a pragmatic approach, if that's the way the compiler wants you to do it then do it that way.
Years ago I was converting a suite of programs from one OS/hardware platform to another.  One program had serious problems because type "real" had insufficient precision on the new machine, that machine offered a compile option which meant "real" automatically meant "double precision" and - after checking for "equivalence" and common" statements - that's the way I went.  Problem solved.  This was back in the days of Fortran IV but I don't think I've ever seen anyone assigning Hollerith values to Real numbers so that was not a problem either.