Data commit

Task/Look-and-say-sequence/C-sharp/look-and-say-sequence-1.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Text;
+using System.Linq;
+
+class Program
+{
+    static string lookandsay(string number)
+    {
+        StringBuilder result = new StringBuilder();
+
+        char repeat = number[0];
+        number = number.Substring(1, number.Length-1)+" ";
+        int times = 1;
+
+        foreach (char actual in number)
+        {
+            if (actual != repeat)
+            {
+                result.Append(Convert.ToString(times)+repeat);
+                times = 1;
+                repeat = actual;
+            }
+            else
+            {
+                times += 1;
+            }
+        }
+        return result.ToString();
+    }
+
+    static void Main(string[] args)
+    {
+        string num = "1";
+
+        foreach (int i in Enumerable.Range(1, 10)) {
+             Console.WriteLine(num);
+             num = lookandsay(num);
+        }
+    }
+}

Task/Look-and-say-sequence/C-sharp/look-and-say-sequence-2.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Text.RegularExpressions;
+
+namespace RosettaCode_Cs_LookAndSay
+{
+    public class Program
+    {
+        public static int Main(string[] args)
+        {
+            Array.Resize<string>(ref args, 2);
+            string ls = args[0] ?? "1";
+            int n;
+            if (!int.TryParse(args[1], out n)) n = 10;
+            do {
+                Console.WriteLine(ls);
+                if (--n <= 0) break;
+                ls = say(look(ls));
+            } while(true);
+
+            return 0;
+        }
+
+        public static string[] look(string input)
+        {
+            int i = -1;
+            return Array.FindAll(Regex.Split(input, @"((\d)\2*)"),
+                delegate(string p) { ++i; i %= 3; return i == 1; }
+            );
+        }
+
+        public static string say(string[] groups)
+        {
+            return string.Concat(
+                Array.ConvertAll<string, string>(groups,
+                    delegate(string p) { return string.Concat(p.Length, p[0]); }
+                )
+            );
+        }
+    }
+}