// Fig. 11.15: PayableInterfaceTest.cs
// Tests interface IPayable with disparate classes.
using System;

public class PayableInterfaceTest
{
   public static void Main( string[] args )
   {
      // create four-element IPayable array
      IPayable[] payableObjects = new IPayable[ 4 ];

      // populate array with objects that implement IPayable
      payableObjects[ 0 ] = new Invoice( "01234", "seat", 2, 375.00M );
      payableObjects[ 1 ] = new Invoice( "56789", "tire", 4, 79.95M );
      payableObjects[ 2 ] = new SalariedEmployee( "John", "Smith", 
         "111-11-1111", 800.00M );
      payableObjects[ 3 ] = new SalariedEmployee( "Lisa", "Barnes",
         "888-88-8888", 1200.00M );

      Console.WriteLine(
         "Invoices and Employees processed polymorphically:\n" );

      // generically process each element in array payableObjects
      foreach ( IPayable currentPayable in payableObjects )
      {
         // output currentPayable and its appropriate payment amount
         Console.WriteLine( "{0} \n{1}: {2:C}\n", currentPayable, 
            "payment due", currentPayable.GetPaymentAmount() );
      } // end foreach
   } // end Main
} // end class PayableInterfaceTest


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