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How to Convert Integers to String in Fortran?

Anonymous User 2440 19-Nov-2014

I have a program in Fortran that saves the results to a file. At the moment I open the file using

OPEN (1, FILE = 'Output.TXT')

However, I now want to run a loop, and save the results of each iteration to the files 'Output1.TXT', 'Output2.TXT', 'Output3.txt', ...

Is there an easy way in Fortran to constuct filenames from the loop counter i?

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Updated on 19-Nov-2014
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1 Answers

Mark M

Mark M

19-Nov-2014

you can write to a unit, but you can also write to a string

program foo

    character(len=1024) :: filename
    write (filename, "(A5,I2)") "hello", 10
    print *, trim(filename)

end program

Please note (this is the second trick I was talking about) that you can also build a format string programmatically.

program foo

    character(len=1024) :: filename
    character(len=1024) :: format_string
    integer :: i
    do i=1, 10
        if (i < 10) then
            format_string = "(A5,I1)"
        else
            format_string = "(A5,I2)"
        endif
        write (filename,format_string) "hello", i
        print *, trim(filename)
    enddo
end program

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