Data commit

Task/Intersecting-number-wheels/C-sharp/intersecting-number-wheels.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+public static class IntersectingNumberWheels
+{
+    public static void Main() {
+        TurnWheels(('A', "123")).Take(20).Print();
+        TurnWheels(('A', "1B2"), ('B', "34")).Take(20).Print();
+        TurnWheels(('A', "1DD"), ('D', "678")).Take(20).Print();
+        TurnWheels(('A', "1BC"), ('B', "34"), ('C', "5B")).Take(20).Print();
+    }
+
+    static IEnumerable<char> TurnWheels(params (char name, string values)[] wheels) {
+        var data = wheels.ToDictionary(wheel => wheel.name, wheel => wheel.values.Loop().GetEnumerator());
+        var primary = data[wheels[0].name];
+        while (true) {
+            yield return Turn(primary);
+        }
+
+        char Turn(IEnumerator<char> sequence) {
+            sequence.MoveNext();
+            char c = sequence.Current;
+            return char.IsDigit(c) ? c : Turn(data[c]);
+        }
+    }
+
+    static IEnumerable<T> Loop<T>(this IEnumerable<T> seq) {
+        while (true) {
+            foreach (T element in seq) yield return element;
+        }
+    }
+
+    static void Print(this IEnumerable<char> sequence) => Console.WriteLine(string.Join(" ", sequence));
+}