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Digital root/Multiplicative digital root: Difference between revisions
Digital root/Multiplicative digital root (view source)
Revision as of 06:20, 5 May 2014
, 10 years agoAdd Perl implementation
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Note that since the first 10 non-negative integers are single digit values, the first column here doubles as a label (representing the corresponding multiplicative digital root).
=={{header|Perl}}==
{{trans|D}}
<lang Perl>use warnings;
use strict;
sub mdr {
my $n = shift;
my($count, $mdr) = (0, $n);
while ($mdr > 9) {
my($m, $dm) = ($mdr, 1);
while ($m) {
$dm *= $m % 10;
$m = int($m/10);
}
$mdr = $dm;
$count++;
}
($count, $mdr);
}
print "Number: (MP, MDR)\n====== =========\n";
foreach my $n (123321, 7739, 893, 899998) {
printf "%6d: (%d, %d)\n", $n, mdr($n);
}
print "\nMP: [n0..n4]\n== ========\n";
foreach my $target (0..9) {
my $i = 0;
my @n = map { $i++ while (mdr($i))[1] != $target; $i++; } 1..5;
print " $target: [", join(", ", @n), "]\n";
}</lang>
=={{header|PL/I}}==
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