Data commit

Task/Caesar-cipher/C-sharp/caesar-cipher.cs

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+using System;
+using System.Linq;
+
+namespace CaesarCypher
+{
+    class Program
+    {
+        static char Encrypt(char ch, int code)
+        {
+            if (!char.IsLetter(ch)) return ch;
+
+            char offset = char.IsUpper(ch) ? 'A' : 'a';
+            return (char)((ch + code - offset) % 26 + offset);
+        }
+
+        static string Encrypt(string input, int code)
+        {
+            return new string(input.Select(ch => Encrypt(ch, code)).ToArray());
+        }
+
+        static string Decrypt(string input, int code)
+        {
+            return Encrypt(input, 26 - code);
+        }
+
+        const string TestCase = "Pack my box with five dozen liquor jugs.";
+
+        static void Main()
+        {
+            string str = TestCase;
+
+            Console.WriteLine(str);
+            str = Encrypt(str, 5);
+            Console.WriteLine("Encrypted: " + str);
+            str = Decrypt(str, 5);
+            Console.WriteLine("Decrypted: " + str);
+            Console.ReadKey();
+        }
+    }
+}