Program 5:  Class Construct & Constructors

Problem Description:

 An Internet service provider has three different subscription
  packages for its customers:

  Package A:  For $15 per month with 50 hours of access provided.
              Additional hours are $2.00 per hour over 50 hours.
              Assume usage is recorded in one-hour increments,
             
  Package B:  For $20 per month with 100 hours of access provided.
              Additional hours are $1.50 per hour over 100 hours.

  Package C:  For $25 per month with 150 hours access is provided.
              Additional hours are $1.00 per hour over 150 hours.
  Assume 30-day billing cycle.

 
  Design a Customer Class. The Customer Object has one
  principal behavior: PayBill. You will need other methods
  to support that behavior.

  Design three Constructors:
     Full set of parameters.
     Customer ID.
     No-Arg.
 
     Write a program that creates four Customer Objects.
     Each object pays the bill.
     Invoke each constructor.
     Validate all input.  


  Demonstrate your design using the following Test Cases:

  Cust ID Test Case    Package     Hours
  ------- ---------    -------     -----
   1101       1           A          90
   2202       2           B         140
   3303       3           C         190
   4404       4           b         730  

     Show console dialog. It must be readable.
     Must convey your thought processes. Comment your code.
    Quality of Craftsmanship Counts