Hi fatalserpent,

Welcome to Monks,The code is having wrong syntax of push and also you have to use $l1 = $#rray1; instead of using $l1 = @rray1;since You are using 0..$l1 in the for loop.Because $l1 = $#rray1 will gives the maximum length minus one of the array size and $l1 = @rray1 will give the maximum size of the array.

See the below code it is working fine,

my $toolong = "seperated by a space ";
print "Enter the value of the first array $toolong";
$tdin = <STDIN>;
print "Enter the value of the second array $toolong";
$din = <STDIN>;
chomp($tdin);
chomp($din);
#Creates arrays and calculates their length.
@rray1 = split(/ /, $tdin);
@rray2 = split(/ /, $din);

$l1 = $#rray1;
$l2 = $#rray2;

unless($l1 == $l2) {
die(print "ERROR: Arrays are different lengths"); #Error check
}

#Does the adding
for(0..$l1){
    $sum =     $rray1[$_] + $rray2[$_];
    push(@sums,$sum) ;
}

for(0..$l1){
print $sums[$_];}
[download]

see the output
Enter the value of the first array seperated by a space 1 3 5
Enter the value of the second array seperated by a space 2 4 6
3711<sumarat@osmosins.wmindia:>
[download]

Thanks and Regards,
Madtoperl.