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  1. or download this
    Can't use an undefined value as an ARRAY reference
  2. or download this
     my $data = data();
 my $count = scalar(@$data); #  $#$data;
print $count;
  3. or download this
    It does not work if the array ref returns nothings
 my $data = data();
 my $count = scalar(@$data); #  $#$data;
print $count;
  4. or download this
    my @count = $data;
my $count = @count;
print $count;