does linux has 64bit version!
 

and can 32bit fortran procedure run on the 64bit cpu !

regards

Many linux distributions are now available in 64 bit versions for "amd64" or "ext64" based x86 cpu's. There are also 64-bit Alpha, 64-bit Sparc, IA64, PPC64, and possibly other 64-bit architecture based distributions.

It is possible to run in "32-bit compatibility" mode so that 32 bit binaries can execute on a 64-bit processor (assuming we are talking about x86_64 here) so I assume your fortran procedure would be fine. I'd also assume you could recompile it with gcc to get a native 64-bit version it you wanted?

Linux hav 64-bit since 1995. And microsoft hav it only in this year.

Lets me resonable here... Windows NT 4.0 at one point did in fact support the 64-bit Alpha.

Dear jtshaw:
but how to "you could recompile it with gcc to get a native 64-bit version it you wanted?"

regards