> > Hi guys....I've spent the whole night trying to figure out about this
> > question. Please help me if you have any clue. Thanks a lot.

> > The code is very easy. I'm trying to call a fortran function from C.

> > The code is as follow:

> > =========C code=========
> > #include "stdio.h"

> > extern float r_ (int * d, float *b);

> > main ()
> > {
> >      float a = 1.5, b = 1.05, c = 1;
> >      int d = 2;
> >      c = r_ (&d, &b);
> >      printf ("%f\n", c);

> > }

> > ==========Fortran Code===========
> >       real function r(m,t)
> >       integer m
> >       real t

> >       print *, m, t
> >       r = 0.1*t+46
> >       print *, r

> >       return
> >       end
> > ================================

> > It doesn't matter what the fortran code does...but when I compile it
> > with g77, the result can't be passed back to the C code, but with
> > gfortran, it can.
> > [du@brutus qr]$ g77 -v
> ...
> > gcc version 3.4.6 20060404 (Red Hat 3.4.6-4)
> > [du@brutus qr]$ gfortran -v
> ...
> > gcc version 4.1.2 20070626 (Red Hat 4.1.2-13)

> > [du@brutus qr]$ gcc -v
> ...
> > gcc version 4.1.2 20070626 (Red Hat 4.1.2-13)

> 1. Your g77 and gcc are of two different generations.
> 2. At some point g77 diverged from gfortran. They no longer (IIRC)
> have the same calling conventions.
> 3. Who cares? Is there a compelling reason to use g77, which is no
> longer actively maintained, instead of gfortran, which is under active
> development?