my @nums = qw (0 1 4 5 6 11 14 15 16 20 24 25 26 30 34 35 36);
print "in=$_\t rounded=", round_nearest5($_), "\n";
sub round_nearest5 # for an positive integer numeric value
my $in = shift;
my ($last_digit) = $in =~ /(\d)\s*$/;
if ($last_digit <5 and $in >= 10 )
$in =~ s/(\d)$/0/;
elsif ($last_digit >=5)
$in += (10-$last_digit);
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