hi friends.........
i am using fedora 8 as my os.
my program is in fortran 90 and am using MPI ... while tryiing to open and write in a file....using 4 processors, some error creeps.which does not allow the files to be opened... can anyone plz tell where am i going wrong?
the program is........

implicit none
use mpi
integer t,Na,Nb,Nc,ios,i,ierr,myrank,p,m,mos,tt,Naa,Nbb,Ncc,j,Nam,uni,info,type,filetype,buff(9)
character(len=10) native
INTEGER(KIND=MPI_OFFSET_KIND) DISP
character(len=15) cpar, cpar1
character(len=25) datfilename
real Pb,k1,k2,r,Nbm,Ncm
CALL MPI_INIT(ierr)
CALL MPI_COMM_SIZE(MPI_COMM_WORLD,p,ierr)
CALL MPI_COMM_RANK(MPI_COMM_WORLD, myrank, ierr )
uni=(myrank+1)*10
write(cpar1,*) myrank
write(cpar,*) uni
datfilename = 'data.'//trim(adjustl(cpar1))
open(uni,file= datfilename,status='new',iostat=ios)
if (ios/=0) then
write(*,*) datfilename,'cannot be opened'
else
write(*,*) ' file ',datfilename,' successfully opened'
endif
CALL MPI_FINALIZE(ierr)

end program

"if (ios/=0) then"

That doesn't look like FORTRAN to me - or did I fall asleep and miss something?

Did you run the program under a debugger and check whether the file was in fact opened and your test is the problem, or if the file really isn't opening.

It is legal FORTRAN.

shreya.hiflying87, it would help if you gave specific error messages. Edit: also, you should put your code inside code tags, so as to preserve indentation.