Ref

using System;

namespace Exercise_8_2
{
    class EntryPoint
    {
        static void Main()
        {
            Tester t = new Tester();
            t.Run();
        }
    }
}


class Tester
{
    public void Run()
    {
        Dyr Animals = new Dyr();

        Animals.DisplayAllAnimals();

        int TheMonkeys = 0;
        int TheSealions = 0;
        int TheZebras = 0;

        Animals.GetAllAnimals(ref TheMonkeys, ref TheSealions , ref TheZebras); //Pass the ints by refence

        Console.WriteLine(" one {0} two {1} three {2}", TheMonkeys, TheSealions, TheZebras);
    }
}

class Dyr  // the zoo keeper control class
{
    private int Monkeys = 3;
    private int Sealions = 5;
    private int Zebras = 8;

    public void DisplayAllAnimals()
    {
        Console.WriteLine("we have {0} Monkeys {1} Sealions and {2} zebars", Monkeys , Sealions , Zebras );
    }

    public void GetAllAnimals( ref int TheMonkeys , ref int TheSealions , ref int TheZebras )
    {
        TheMonkeys = Monkeys;  // Takes references to these ints
        TheSealions = Sealions;
        TheZebras = Zebras;
    }

}