Hey, folks .. Trying to work my way through 'Learning Perl' and I'm on Chapter 4 (Subroutines). I think I've got 90% of a working program but I can't get my head around the last part and it seems to do with using information generated outside a subroutine inside the subroutine and vice versa.

Please help. Thanks in advance. This is my code

#!/usr/bin/perl

use strict;
use warnings;

sub total {
  my $sum;
  foreach (@_) {
    $sum += $_;
  }
  $sum;
}

print "Give me some numbers to add together:\n";
my @num_list = <STDIN>;
my $num_list_total = total(@num_list);

my $size = @num_list;
my @average = $num_list_total / $size;

print "The total of the numbers in your list is $num_list_total.\n";
print "The average of the numbers is @average.\n";

sub above_average {
#  my $average = average(@_);
  @average = average(@_);
  my @list;
  foreach my $element (@_) {
    if ($element > @average) {
      push @list, $element;
    }
  }
  @list;
}

my $num_above_average = above_average(@num_list);

print "The following numbers are above the group average: $num_above_a
+verage\n";

[download]

In reply to Pure variable confusion! by jmvbxx

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.