Anonymous Monk:
*An exercise of an array of "unknown length" would be to populate an array from a file of unknown lines (thus number of array elements) with each number listed on a line by itself.*
In the light of the above statement, let assume, your file with unknown length is given as below __DATA__, consider the codes below:
`use warnings;
use strict;
my $sum = 0;
my @nums; # same as my @nums = ();
while (<DATA>) {
chomp;
push @nums, $_;
}
$sum += $_ for @nums;
my $size = @nums;
my $average = $sum / $size;
print $average, $/;
__DATA__
1
2
3
4
5
6
`
**NOTE:** that @nums = () is assigning an empty list to the variable array @nums, so the array is empty. So, $size will be 0.
You might what to check the following Up:
push, pop, shift, unshift
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me
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