error calling c functions from gfortran

[Tobias Burnus]

Hi,

Steve Kargl wrote:
>> I get the wrong answer calling c programs from a gfortran program. The same c 
>> functions work when called from a c main program. I guess I need some kind of 
>> interface statement to call c functions from gfortran.
> For others on the list, I've already answered Mike in a private
> email.  He needs to change his c code from pass-by-value to
> pass-by-reference.
>   
I only want to point out that gfortran 4.3 also supports pass-by-value
using the VALUE statement/attribute in the interface block. (It also
works for Fortran subroutines.)

Alternatively, enclosing the variables in %VAL() in the call should work
as well (DEC extension).

Nonetheless, as Tobias S. pointed out, using the ishift intrinsic is the
better approach in this case.

Tobias B.