* C/Fortran mixing - Passing arrays
@ 2003-05-18 16:37 Elias Athanasopoulos
2003-05-18 19:29 ` Glynn Clements
0 siblings, 1 reply; 2+ messages in thread
From: Elias Athanasopoulos @ 2003-05-18 16:37 UTC (permalink / raw)
To: linux-c-programming
Hello!
I have a fortran subroutine with the prototype:
subroutine evolvePDF (x, Q, f)
...
real*8 f(-6,6)
which I want to call from C. My problem is that C, IIRC, doesn't support
negative indexes. Is there a workaround?
Regards,
Elias
--
University of Athens I bet the human brain
Physics Department is a kludge --Marvin Minsky
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: C/Fortran mixing - Passing arrays
2003-05-18 16:37 C/Fortran mixing - Passing arrays Elias Athanasopoulos
@ 2003-05-18 19:29 ` Glynn Clements
0 siblings, 0 replies; 2+ messages in thread
From: Glynn Clements @ 2003-05-18 19:29 UTC (permalink / raw)
To: Elias Athanasopoulos; +Cc: linux-c-programming
Elias Athanasopoulos wrote:
> I have a fortran subroutine with the prototype:
>
> subroutine evolvePDF (x, Q, f)
> ...
> real*8 f(-6,6)
>
> which I want to call from C. My problem is that C, IIRC, doesn't support
> negative indexes.
C supports negative indices in the sense that the following works:
int f[8] = {1,2,3,4,5,6,7,8};
int *p = f + 4;
int i;
for (i = -4; i < 4; i++)
printf("%d\n", p[i]);
--
Glynn Clements <glynn.clements@virgin.net>
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