Initial data commit

Task/Damm-algorithm/Perl/damm-algorithm.pl

@@ -0,0 +1,21 @@
+sub damm {
+    my(@digits) = split '', @_[0];
+    my @tbl =([< 0 3 1 7 5 9 8 6 4 2 >],
+              [< 7 0 9 2 1 5 4 8 6 3 >],
+              [< 4 2 0 6 8 7 1 3 5 9 >],
+              [< 1 7 5 0 9 8 3 4 2 6 >],
+              [< 6 1 2 3 0 4 5 9 7 8 >],
+              [< 3 6 7 4 2 0 9 5 8 1 >],
+              [< 5 8 6 9 7 2 0 1 3 4 >],
+              [< 8 9 4 5 3 6 2 0 1 7 >],
+              [< 9 4 3 8 6 1 7 2 0 5 >],
+              [< 2 5 8 1 4 3 6 7 9 0 >]
+              );
+    my $row = 0;
+    for my $col (@digits) { $row = $tbl[$row][$col] }
+    not $row
+}
+
+for (5724, 5727, 112946) {
+    print "$_:\tChecksum digit @{[damm($_) ? '' : 'in']}correct.\n"
+}