Re^4: Help with arrays

#!/usr/bin/perl

@nums = ();
for(0..$#nums)
{
$sum += $_;
}
$size = $#nums;
$average = $sum / $size;
print "$average";
[download]

This fix the illegal division of 0 and now it gives me the result of 0

Comment on Re^4: Help with arrays Download Code

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Re^5: Help with arrays by 2teez (Vicar) on Sep 22, 2012 at 05:52 UTC
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` [download] 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	[reply] [d/l]

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Re^5: Help with arrays
by 2teez (Vicar) on Sep 22, 2012 at 05:52 UTC

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
[download]

NOTE:

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

[reply]
[d/l]