Writing multiple output files in Fortran

Question

Dear All, I am writing a code that writes the out put in multiple files named as 1.dat, 2.dat, ..... Here is my code but it gives some unusual output. May you tell me what i

Answer 1

So there are a few things not immediately clear about your code, but I think here the most relevant bits are that you want to specify the filename with file = in the open statement, not the formatting, and looping over units with iout is problematic because you'll eventually hit system-defined units for stdin and stdout. Also, with that format line it looks like you're getting ready to create the filename, but you never actually use it.

I'm not sure where you're; going with the mod test, etc, but below is a stripped down version of above which just creates the files ina loop:

program manyfiles
    implicit none
    character(len=70) :: fn
    integer, parameter :: numfiles=40
    integer, parameter :: outunit=44

    integer :: filenum, j

    do filenum=1,numfiles
        ! build filename -- i.dat
        write(fn,fmt='(i0,a)') filenum, '.dat'

        ! open it with a fixed unit number
        open(unit=outunit,file=fn, form='formatted')

        ! write something
        write(outunit, *) filenum

        ! close it 
        close(outunit)
    enddo
end program manyfiles

Answer 2

In my case, I want the file name have an prefix likedyn_

program manyfiles
implicit none
character(len=70) :: filename
integer, parameter :: numfiles=40
integer, parameter :: outunit=44

integer :: filenum, j

do filenum=1,numfiles
    write(filename,'("dyn_",i0,".dat")') filenum
    open(unit=outunit,file=filename, form='formatted')
    write(outunit, *) filenum
    close(outunit)
enddo
end program manyfiles