(Package Inheritance Hierarchy) Use the Package
(Package Inheritance Hierarchy) Use the Package inheritance hierarchy created in Exercise 20.9 to create a program that displays the address information and calculates the shipping costs for several Packages. The program should contain a vector of Package pointers to objects of classes Two Day Package and Over night Package. Loop through the vector to process the Packages polymorphically. For each Package invoke get functions to obtain the address information of the sender and the recipient then print the two addresses as they would appear on mailing labels. Also call each Packages calculate Cost member function and print the result. Keep track of the total shipping cost for all Packages in the vector and display this total when the loop terminates. Exercise 20.9 (Package Inheritance Hierarchy) Package-delivery services such as FedEx DHL and UPS offer a number of different shipping options each with specific costs associated. Create an inheritance hierarchy to represent various types of packages. Use class Package as the base class of the hierarchy then include classes Two Day Package and Over night Package that derive from Package. Base class Package should include data members representing the name address city state and ZIP code for both the sender and the recipient of the package in addition to data members that store the weight (in ounces) and cost per ounce to ship the package. Packages constructor should initialize these data members. Ensure that the weight and cost per ounce contain positive values. Package should provide a public member function calculate Cost that returns a double indicating the cost associated with shipping the package. Packages calculate Cost function should determine the cost by multiplying the weight by the cost per ounce. Derived class Two Day Package should inherit the functionality of base class Package but also include a data member that represents a flat fee that the shipping company charges for two-day-delivery service. Two Day Packages constructor should receive a value to initialize this data member. Two Day Package should redefine member function calculate Cost so that it computes the shipping cost by adding the flat fee to the weight-based cost calculated by base class Packages calculate Cost function. Class Over night Package should inherit directly from class Package and contain an additional data member representing an additional fee per ounce charged for overnight-delivery service. Over night Package should redefine member function calculate Cost so that it adds the additional fee per ounce to the standard cost per ounce before calculating the shipping cost. Write a test program that creates objects of each type of Package and tests member function calculate Cost.
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