using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        ITransactions i = null;

        i = new Transaction();

        double num = i.getAmount();

        Console.WriteLine(num);

        i = new Transaction2();

        double num2 = i.getAmount();

        Console.WriteLine(num2);

    }

}

public interface ITransactions

{

   // interface members

   void showTransaction();

   double getAmount();

}   

public class Transaction : ITransactions

   {

      private string tCode;

      private string date;

      private double amount;

      public Transaction()

      {

         tCode = " ";

         date = " ";

         amount = 14.000;

      }

      public Transaction(string c, string d, double a)

      {

         tCode = c;

         date = d;

         amount = a;

      }

      public double getAmount()

      {

         return amount;

      }

      public void showTransaction()

      {

         Console.WriteLine("Transaction: {0}", tCode);

         Console.WriteLine("Date: {0}", date);

         Console.WriteLine("Amount: {0}", getAmount());

      }

   }

public class Transaction2 : ITransactions

   {

      private string tCode;

      private string date;

      private double amount;

      public Transaction2()

      {

         tCode = " ";

         date = " ";

         amount = 0.0;

      }

      public Transaction2(string c, string d, double a)

      {

         tCode = c;

         date = d;

         amount = a;

      }

      public double getAmount()

      {

         return amount;

      }

      public void showTransaction()

      {

         Console.WriteLine("Transaction: {0}", tCode);

         Console.WriteLine("Date: {0}", date);

         Console.WriteLine("Amount: {0}", getAmount());

      }

   }