Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!hub.ucsb.edu!ucsbuxa!3003jalp
From: 3003jalp@ucsbuxa.ucsb.edu (Applied Magnetics)
Newsgroups: comp.lang.fortran
Subject: Re: Calling FORTRAN routines from C
Keywords: Unwanted conversions for single-precision return values
Message-ID: <7800@hub.ucsb.edu>
Date: 12 Dec 90 22:12:22 GMT
References: <6928@uceng.UC.EDU>
Sender: news@hub.ucsb.edu
Lines: 19

In article <6928@uceng.UC.EDU> dmocsny@minerva.che.uc.edu (Daniel Mocsny) writes:

> [problems recovering a Fortran function value from a C program.]

That's a new one.  My own C-Fortran chimeras always give me trouble
with the following:
  -I/O.  The C and Fortran I/O subsystems may interfere.  Do all I/O
   in the same language or else...
  -Common blocks.  There may be no way to get at a common block from C.
The documentation is not always complete or clear in these two areas.
"Ordinary" function and subroutine calls usually work.  Needless to
say, all this is system-dependent.  I guess I can add function calls to
my watch list.

In the case at hand, subroutine calls seem to work.  You can always
write a Fortran subroutine through which you will call the Fortran
function from C.

--Pierre Asselin, R&D, Applied Magnetics Corp.  I speak for me.