Data commit

Task/Rot-13/C-sharp/rot-13.cs

@@ -0,0 +1,38 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+class Program
+{
+    static char Rot13(char c)
+    {
+        if ('a' <= c && c <= 'm' || 'A' <= c && c <= 'M')
+        {
+            return (char)(c + 13);
+        }
+        if ('n' <= c && c <= 'z' || 'N' <= c && c <= 'Z')
+        {
+            return (char)(c - 13);
+        }
+        return c;
+    }
+
+    static string Rot13(string s)
+    {
+        return new string(s.Select(Rot13).ToArray());
+    }
+
+
+    static void Main(string[] args)
+    {
+        foreach (var file in args.Where(file => File.Exists(file)))
+        {
+            Console.WriteLine(Rot13(File.ReadAllText(file)));
+        }
+        if (!args.Any())
+        {
+            Console.WriteLine(Rot13(Console.In.ReadToEnd()));
+        }
+    }
+}