How to read data from text file in FORTRAN

Question

I want to read some data from a text file. The name of the file is 'freq.txt' and it is in the same directory where I compiled the code. The text file looks like:

100 cm-1
200 cm-1
300 cm-1

The number of lines may vary. I just want to read the number for further processing. Can anyone help me to do this?

Did you try a search? http://stackoverflow.com/questions/2813502/reading-input-files-in-fortran — Carey Gregory, Apr 09 '14 at 00:00
and http://stackoverflow.com/questions/8828377/reading-data-from-txt-file-in-fortran — Barbara Laird, Apr 09 '14 at 00:02

Alex · Accepted Answer · 2018-07-18T17:15:56.760

2

program dataread

integer, parameter :: last=3
real :: dat(last)

open(1,file='freq')
do i=1,last
    read(1,*) dat(i)
    write(*,*) dat(i)
end do
close(1)

end program

edited Jul 18 '18 at 17:15

answered Apr 09 '14 at 02:05

Alex

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Better not to use unit numbers under 10. – Vladimir F Героям слава Jul 18 '18 at 20:04

How to read data from text file in FORTRAN

1 Answers1