Re: File Reading

From: Paul Van Delst (paul.vandelst_at_noaa.gov)
Date: 07/28/04 

Date: Wed, 28 Jul 2004 16:54:28 -0400

David Young wrote:
> Hi, All!
>
> This might be a newbie question but I don't know the solution. So
> forgive me if it is too simple.
>
> I am planning to read a file in Fortran (CVF 6.6), which contains both
> text and numbers. It is looks like this:
> # text 1
> 12 34 56
> # text 2
> # text 3
> 12 34
> The number records in each line are known but the positions of the text,
> which is supposed to be the comments, are not. I hope I made the problem
> clear.
> What I want to do is exam each line before I read in, if it begins with
> "#", I will ignore it. Otherwise, I will re-read the line and get the
> numbers out.
> I know this can be done easily in c but I could not find a simple
> solution using Fortran. I would really appreciate if somebody could
> offer me a solution.

Sounds like a homework problem.

My approach to this sort of problem is to read each line into a character string "buffer",
examine the string for "#". If it's there, save the buffer string in a separate "comments"
string. If it's not, use an internal read to extract the numbers from the buffer string.

A variation on this would be to read the entire file line by line first to determine the
number of comment and data lines and then allocate arrays to the required size before
rewinding the file and reading them proper, like.

cheers,

paulv

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