using System;

public class Program

{

    public static void Main()

    {

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

            Console.WriteLine("privet".Equals("privet"));

            Console.WriteLine(ReferenceEquals("privet", "privet"));

            var anotherPriver = "pri"+"vet";

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

            Console.WriteLine(ReferenceEquals("privet", anotherPriver));

            var prefix = "pri";

            var suffix = "vet";

            var concataneted = prefix + suffix;

            Console.WriteLine(ReferenceEquals((object)"privet", (object)concataneted));

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

            Console.WriteLine("privet".Equals(concataneted));

            var interned = string.Intern(prefix + suffix);

            Console.WriteLine(ReferenceEquals("privet", interned));

            Console.WriteLine();

            Console.WriteLine("Tokens:");

            var firstToken = new Token { Value = 5 };

            var secondToken = new Token { Value = 5 };

            Console.WriteLine(ReferenceEquals(firstToken, secondToken));

            Console.WriteLine(firstToken == secondToken);

            Console.WriteLine(firstToken.Equals(secondToken));

    }

    public class Token

    {

        public int Value {get;set;}

    }

}