Data update

Task/Damm-algorithm/Julia/damm-algorithm.jl

@@ -0,0 +1,20 @@
+function checkdigit(n)
+    matrix = (
+        (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))
+    row = 0
+    for d in string(n)
+        row = matrix[row + 1][d - '0' + 1]
+    end
+    return row
+end
+
+foreach(i -> println("$i validates as: ", checkdigit(string(i)) == 0), [5724, 5727, 112946])