This paints a better picture:
use strict;
use warnings;
use Data::Dumper ();
my @rocks = ();
$rocks[0] = 'bedrock';
$rocks[1] = 'slate';
$rocks[2]= 'lava';
$rocks[3] = 'crushed rock';
print Data::Dumper::Dumper(\@rocks);
$rocks[99] = 'schist';
print Data::Dumper::Dumper(\@rocks);
$#rocks = 2; # forget all rocks after 'lava'
print Data::Dumper::Dumper(\@rocks);
$#rocks = 99; # add 97 undef e
print Data::Dumper::Dumper(\@rocks);
Also, if you want to do surgery on your array, look at splice.
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