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Re: Trying to do multiple while loops on the same input file

by thezip (Vicar)
on Jun 01, 2011 at 16:35 UTC ( #907662=note: print w/ replies, xml ) Need Help??


in reply to Trying to do multiple while loops on the same input file

This doesn't answer to your original problem of reading a file with multiple while loops, but it does present another WTDI that, to me, seems much more natural.

Since your file is really small, read it in its entirety into and array of lines, a la:
use strict; use warnings; use autodie; my $filename = 'filename.txt'; open my $ifh, '<', $filename; my @lines = <$ifh>; close $ifh;

Now you can process the content of you file to your heart's content by simply maintaining the relevant indices for the lines you want to be dealing with, and iterating via "for" loops. You can do this as many times as you want without having to worry about iterating via <>...


Updated: Added blurb re: for-loop iteration


What can be asserted without proof can be dismissed without proof. - Christopher Hitchens


Comment on Re: Trying to do multiple while loops on the same input file
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Re^2: Trying to do multiple while loops on the same input file
by elef (Friar) on Jun 01, 2011 at 17:13 UTC
    Good suggestion. In this particular case, I just moved the open and close commands inside the loop, but in other situations, reading the file into an array would make more sense.

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