use strict;
use warnings;
sub round5 {
my $num = shift;
return $num+2 - ($num+2) % 5; # <------ TIMTOWTDI ;-)
}
for (0..10) {
printf "%3d -> %3d %3d -> %3d\n",
$_, round5($_), -$_, round5(-$_);
}
__DATA__
0 -> 0 0 -> 0
1 -> 0 -1 -> 0
2 -> 0 -2 -> 0
3 -> 5 -3 -> -5
4 -> 5 -4 -> -5
5 -> 5 -5 -> -5
6 -> 5 -6 -> -5
7 -> 5 -7 -> -5
8 -> 10 -8 -> -10
9 -> 10 -9 -> -10
10 -> 10 -10 -> -10
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