using System;

​

namespace CISS_ProgrammingExercise

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("The output:\n");

            Exercise3();

            Console.WriteLine("\n\nPress a key to continue..");

            Console.ReadKey();

        }

​

        // instantiate objects and call methods from any of the below classes to write 

        // "Never send a human to do a machine's job." 

        // to the console

        static void Exercise3()

        {

            Base.Base();

            var send = Base.msg;

            Console.Write(send);

​

            var derived = new Derived();

            var derived = derived.GetString(); //a

            Console.Write(derived);

​

            var finished = new Finished();

            var human = finished.GetString(); //human

            Console.Write(human);

            (Base)derived.Print(); //to

​

            derived.Print(); //do

​

            var moreDerived = new MoreDerived();

            moreDerived.Print(); //mach

​

            var moreDerived2 = new MoreDerived2();

            MoreDerived2.MoreDerived2(); //ine

            moreDerived2.GetString();//'s

            moreDerived.IWord2.Print(); //jobs

​

        }

        public interface IWord

        {

            void Print();

        }

​

        public interface IWord2 : IWord

        {

            new void Print();

        }

​

        public abstract class Base

        {

            protected static string msg = "send ";

​

            public Base()

            {

                Console.Write(this.GetString());

            }

​

            static Base()

            {

                Console.Write("Never ");

            }

​

            public virtual void Print()

            {

                Console.Write("to ");

            }

​

            protected virtual string GetString()

            {

                return "llama ";

            }

        }

​

        public class Derived : Base, IWord

        {

​

            static Derived()

            {

                Console.Write(Derived.msg);

            }

​

            public new virtual void Print()

            {

                Console.Write("do ");

            }

​

            protected override string GetString()

            {

                return "a ";

            }

        }

​

        public sealed class MoreDerived : Derived, IWord

        {

            public override void Print()

            {

                Console.Write("mach");

            }

​

            void IWord.Print()

            {

                Console.Write("a ");

            }

​

            protected override string GetString()

            {

                return "do ";

            }

        }

​

        public sealed class MoreDerived2 : Derived, IWord2

        {

​

            static MoreDerived2()

            {

                Console.Write("ine");

            }

​

            public new void Print()

            {

                Console.Write("job. ");

            }

​

            void IWord2.Print()

            {

                Console.Write("job.");

            }

​

            protected override string GetString()

            {

                return "'s ";

            }

        }

​

        public abstract class Unfinished : Base

        {

            protected new void Print()

            {

                Console.Write("camel ");

            }

​

            protected override string GetString()

            {

                return "human ";

            }

        }

​

        public class Finished : Unfinished

        {

        }

​

​

​

    }

}

​