I am using a couple of subroutines in a basic script to parse a text file:
#!/usr/bin/perl -w
use strict;
my $text, $ques, $ans;
open(IN, "<$ARGV[0]")||die"Couldn't open $ARGV[0]: $!\n";
while(<IN>){
$text = &do_one_thing($_);
($ques, $ans) = &do_another_thing($text);
print $ques." :: ".$ans."\n";
}
close(IN);
sub $do_one_thing{
my $line=uc($_);
$line =~ s/this/that/g;
return($line);
}
sub $do_another_thing{
my $another_line, $one, $two;
$another_line = $_;
($one, $two) = $another_line =~ /(.[^\*]*)\*(.*)/;
return($one, $two);
}
So my question is, why do $ques and $ans remain lowercase; more generally, why does the second subroutine again use $_ from the main body of the program, rather than the local $_ (which I'm guessing ought to be $text)? I can rearrange the script pretty simply to make it work (by not using the extra variable) which I did, but it made me curious as to why it doesn't work the way I've written it above...
thanks!
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|