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CS304 Assignment 3 solution Fall 2017

Suppose METRO Cash & Carry Pakistan has given you a task to develop an automatic checkout system in C++. All items are identifiable by means of a merchandise computer code (barcode) and the item name. Groceries are either sold in packs or by weight. Packed items have fixed prices. The price of groceries sold by weight is calculated by multiplying the weight by the current price per kilogram. As a software developer your task is to develop the classes needed to represent the products first and organize them hierarchically according to the UML diagram given on next page.

                                                                             Items

Properties:

Bar code

Item Name

Methods:

setbarCode()

getbarCode()

scanner()

printer()

PackedFood                                                                                            FreshFood

Properties:

Price per piece

Methods:

getPrice()

setPrice()

scanner()

printer()

Properties:

Weight

Price per rupee

Methods:

setWght()

getWght()

scanner()

printer()

Figure: UML for METRO Cash & Carry Pakistan

 Tasks for you:

  1. Make a base class named Item then define its private and public members. Define a constructor with parameters for both data members (Barcode, Item Name). You should add default values for the parameters to provide a default constructor for the class. In addition to the access methods setCode() and getCode(), you are also required to define the methods scanner() and printer(). These methods will simply output item data on screen or read the data of an item from the keyboard.
  2. Define two derived classes PackedFood and FreshFood. In addition to the Item class data, the PackedFood class should contain the unit price. The FreshFood class should contain a weight and a price per kilogram as data members. You are required to define a constructor with parameters providing default-values for all data members in both classes. Also define the access methods needed for the new data members.

Make the main() function then test the classes in it, that creates two objects each of the types ItemPackedFood and FreshFood. One object of each type should be fully initialized in the object definition. You can use the default constructor to create the other object. The get() and set() methods and the scanner() method should be well written and the printer() method should display the items on screen.

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