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How to Convert Integers to String in Fortran?

Anonymous User 2857 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?

Ask by Anonymous User

Updated 19 Nov 2014

1 Answers

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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