using System;

public class Program

{

    public static void Main()

    {

Customer[] custArray = new Customer[4];

​

        // First Customer

        custArray[0] = new Customer() { FirstName = "Joe", LastName = "Smith", PaymentProcess = "visa",Orders = new Order[2]};

        custArray[0].Orders[0] = new Order() { Description = "Shoes", Price = 19.99M, Quantity = 1 };

        custArray[0].Orders[1] = new Order() { Description = "Pants", Price = 29.99M, Quantity = 2 };

       decimal totaldue1 = (custArray[0].Orders[0].Quantity * custArray[0].Orders[0].Price) + (custArray[0].Orders[1].Quantity * custArray[0].Orders[1].Price);

        // Second Customer

        custArray[1] = new Customer() { FirstName = "Sally", LastName = "Jones",PaymentProcess = "Debit", Orders = new Order[2] };

        custArray[1].Orders[0] = new Order() { Description = "Shoes", Price = 39.99M, Quantity = 1 };

        custArray[1].Orders[1] = new Order() { Description = "Pants", Price = 49.99M, Quantity = 1 };

        decimal totaldue2 = (custArray[1].Orders[0].Quantity * custArray[1].Orders[0].Price) + (custArray[1].Orders[1].Quantity * custArray[1].Orders[1].Price);

        //third customer

        custArray[2] = new Customer() {FirstName = "Ady",LastName = "Htim",PaymentProcess = "paypal",Orders = new Order[2]};

        custArray[2].Orders[0]=new Order(){Description = "books",Price = 50, Quantity = 2};

        custArray[2].Orders[1] = new Order(){Description ="pens",Price = 10, Quantity =10};

        decimal totaldue3 = (custArray[2].Orders[0].Quantity * custArray[2].Orders[0].Price) + (custArray[2].Orders[1].Quantity * custArray[2].Orders[1].Price);

        //------------------------------------------------------------------------------

​

        foreach (var customer in custArray)

        {

            if (customer == null) continue;

​

            Console.WriteLine("Customer:\n");

            Console.WriteLine("{0, 15} {1, 17} {2,19}", "First Name", "Last Name","payment proces");

            Console.WriteLine("{0, 10} {1, 20} {2,20}" , customer.FirstName, customer.LastName,customer.PaymentProcess);

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

            Console.WriteLine("Orders:\n");

​

            foreach (var order in customer.Orders)

            {

                if (order == null) continue;

​

                Console.WriteLine("{0, 10} {1, 10} {2, 10}", order.Description, order.Price, order.Quantity );

            }

        }

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

        Console.WriteLine("Payment:\n");

        Console.WriteLine(" First custumer payment in $ ={0} by: {1}", totaldue1 ,custArray[0].PaymentProcess);

        Console.WriteLine(" Second custumer payment in $= {0} by: {1}", totaldue2, custArray[1].PaymentProcess);

        Console.WriteLine(" Third custumer payment in $ ={0} by: {1}", totaldue3, custArray[2].PaymentProcess);

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

        Ipayment visa=new visa();

        Ipayment debit=new Depit(); 

        Ipayment paypal=new Paypal();

        visa.payment = totaldue1;

        debit.payment = totaldue2;

        paypal.payment = totaldue3;

        decimal total = totaldue1+totaldue2+totaldue3;

​

        Console.WriteLine("visa payment in $={0}", totaldue1);

        Console.WriteLine("Debit payment in $={0}",totaldue2);

        Console.WriteLine("Paypal in $= {0}",totaldue3);

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

        Console.WriteLine("total payment at the end of the day in $={0}",total);

​

    }

}

​

class Customer

{

    public string FirstName;

    public string LastName;

    public Order[] Orders;

    public string PaymentProcess;

   // public decimal Totaldue;

​

​

}

​

class Order

{

    public string Description;

    public decimal Price;

    public decimal Quantity;

​

}

  interface Ipayment

{

     decimal payment { get; set; }

​

}

​

internal class visa : Ipayment

{

    private decimal _payment;

​

    public decimal payment

    {

        get { return _payment; }

        set { _payment = value; }

​

    }

}

​

public class Depit : Ipayment

{

    private decimal _payment;

​

    public decimal payment

    {

        get { return _payment; }

        set { _payment = value; }

​

    }

}

​

public class Paypal : Ipayment

        {

            private decimal _payment;

​

            public decimal payment

            {

                get { return _payment; }

                set { _payment = value; }

​

            }

​

        }