my %statistics = ( 1, 0, 2, 0, 3, 0, 4, 0, 5, 0,
           6, 0, 7, 0, 8, 0, 9, 0, 10, 0
);

foreach my $statistic (sort keys %statistics) 
{
  print $statistic ." ".$statistics{$statistic}. "\n";
}
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Are keys always of type string? If not, why is 10 printed after 1 instead of 2? How do I sort as: 1,2,3...10. Thanks.