Initial data commit

Task/Damm-algorithm/C-sharp/damm-algorithm.cs

@@ -0,0 +1,39 @@
+using System;
+
+namespace DammAlgorithm {
+    class Program {
+        static int[,] table = {
+            {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},
+        };
+
+        static bool Damm(string s) {
+            int interim = 0;
+            foreach (char c in s) {
+                interim = table[interim, c - '0'];
+            }
+            return interim == 0;
+        }
+
+        static void Main(string[] args) {
+            int[] numbers = { 5724, 5727, 112946, 112949 };
+            foreach (int number in numbers) {
+                bool isValid = Damm(number.ToString());
+                if (isValid) {
+                    Console.WriteLine("{0,6} is valid", number);
+                }
+                else {
+                    Console.WriteLine("{0,6} is invalid", number);
+                }
+            }
+        }
+    }
+}