using System;
 
namespace Caesar
{
    class Program
    {
        static void Main(string[] args)
        {
            char zeichen = 'A';
            int key = 3;
 
            Console.WriteLine("\tCaesar Verschlüsselung\n");
            Console.Write("Geben Sie einen Grossbuchstaben ein: ");
            zeichen = char.Parse(Console.ReadLine());
 
            int asciiNr = (int) zeichen;    // Typenkonvertierung char --> int oder
            // int asciiNr = Convert.ToInt32(zeichen);
            int zahl = asciiNr - 65;
            zahl = (zahl + key) % 26;       // Addition und Modulo-Rechnung
            zahl = zahl + 65;
            zeichen = (char)zahl;           // Typenkonvertierung int --> char oder
            // zeichen = Convert.ToChar(zahl);
 
            Console.Write("Der verschlüsselte Grossbuchstabe ist: "); 
            Console.WriteLine(zeichen + "\n");
 
        }
    }    
}

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