using System;

​

public class Program

{

    static void cbv(char x){

        x++;

        Console.WriteLine("Call-by-Value: " + x);

    }

    static void cbr(ref char x){

        x++;

        Console.WriteLine("Call-by-Reference: " + x);

    }

    public static void Main()

    {

        char x = 'A';

        Console.WriteLine("char x = 'A'");

        Console.WriteLine("========================");

        cbv(x);

        Console.WriteLine("Nach Call-by-Value: " + x);

        Console.WriteLine("========================");

        cbr(ref x);

        Console.WriteLine("Nach Call-by-Reference: " + x);

    }

}