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Open a file Programmatically in Fortran.

Posted on 2006-11-01
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Last Modified: 2013-11-08
I want a small code in Fortran that opens a .txt file when executed. I have Lahey90 V4.5 to compile this program.

Thank you.
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Question by:Aiysha
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5 Comments
 
LVL 11

Expert Comment

by:cup
ID: 17853927
You didn't say whether you wanted to read from it or to write to it.

To open a file for reading on channel nnnn

open (nnnn, 'afile.txt', status='old')

To open for writing

open (nnnn, 'afile.txt', status='new')
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Author Comment

by:Aiysha
ID: 17853979
cup,
I might be asking for too much, but can you please send me a entire program, so I can just compile it..I am very new to fortran..

Thank you.
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LVL 11

Accepted Solution

by:
cup earned 2000 total points
ID: 17872978
Sure

program main
    ! SRC is the input channel
    ! DST is the output channel
    integer SRC, DST
    parameter (SRC = 20, DST = 30)  ! any number will do
    integer i, isq

    ! Output a table of squares
    ! use unknown so you can run the program over and  over again
    open (DST, file='squares.txt', status='unknown')
    do i = 1, 10, 1
       isq = i * i
       write (DST, '(I2, I4)') i, isq
    end do
    close (DST)

    ! Read the file and print it
    open (SRC, file='squares.txt', status='old')
    do while (.true.)
       read (SRC, '(I2, I4)', end = 100) i, isq
       print *, i, isq
    end do
!   end of file reached
100 continue
    close (SRC)
    stop
end program
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