At this level, your program will have some basic classes with specifications as below. You may need

o define methods wherever appropriate to support these classes. At the end of the PASS level, your

orogram should be able to run with a menu described in the class Operations.

Customers:

Class Customer

Each customer has a unique ID$,$ unique name $($a name will only contain alphabet characters$).$

Each customer also has some reward points. You are required to write the class named

Customer to support the following:

i$.$ Attributes ID$,$ name, and reward

ii$.$ Constructor takes the values of ID$,$ name, and reward as arguments

iii. Appropriate getter methods for the attributes of this class

iv$.$ A method get$\_$reward which should be an empty super method

v$.$ A method get$\_$discount which should be an empty super method

vi$.$ A method update$\_$reward which should be an empty super method

vii. A method display$\_$info which should be an empty super method

Class BasicCustomer

All Basic customers have a flat reward rate when making a purchase $($i$.$e$.,$ all Basic customers

have the same reward rate$).$ By default, the flat reward rate is $100\%.$ The class BasicCustomer

should have the following components:

i$.$ An attribute for the reward rate

ii$.$ Constructor takes the appropriate parameters$/$arguments$.$

iii. Appropriate getter methods for the attributes of this class

iv$.$ A method get$\_$reward which takes the total cost and returns the reward. Note, the

reward is always rounded. For example, when the total cost is $14\mathrm{.}8$ and the reward rate

is $100\%,$ then the method will returns the reward which is round$(14\mathrm{.}8100\%)=15.$

v$.$ A method update$\_$reward which takes a value and increase the attribute reward with

that value.

vi$.$ A method display$\_$info that prints the values of the BasicCustomer attributes.

vii. A method set$\_$reward$\_$rate to adjust the reward rate. This method affects all Basic

customers.

Class VIPCustomer

A VIP customer not just receives the reward but also gets a discount for the purchase. The

reward rate is the same for all VIP customers and has the default value of $100\%.$ On the other

hand, the discount rate is different among VIP customers. If not specified, the discount rate is

set as $8\%.$

Note that the reward is computed after the discount. For example, with a reward rate of $100\%$

and discount rate of $8\%,$ if a VIP customer makes a purchase with the original total cost of $30$$$,$

then discount will be $308\%=2\mathrm{.}4$$$,$ the total cost after the discount is $27\mathrm{.}6$$$,$ and thus, the

reward is round$(27\mathrm{.}6100\%)=28.$

The class VIPCustomer should have the following components:

i$.$ Appropriate attributes to support the reward rate and discount rate ii$.$ Constructor takes the appropriate parameters$/$arguments

iii. Appropriate getter methods for the attributes of this class

iv$.$ A method get$\_$discount which takes the total cost and returns the discount offered

v$.$ A method get$\_$reward which takes the total cost and returns the reward

vi$.$ A method update$\_$reward which takes a value and increase the attribute reward with

that value.

vii. A method display$\_$info that prints the values of the VIPCustomer attributes

viii. A method set$\_$reward$\_$rate to adjust the reward rate. This method affects all VIP

customers

ix$.$ A method set$\_$discount$\_$rate to adjust the discount rate of each individual VIP

customer

Products:

Class Product

This class is to keep track of information on different products that the pharmacy offers. This

class supports the following information:

ID: a unique identifier of the product

name: the name of the product $($you can assume the product names are unique and they

do not include any digit$)$

price: the unit price of the product

A method display$\_$info that prints the values of the Product attributes

Extra attributes and methods if you want to define $($for VIP customers$),$ and the reward. The method list$\_$products will display the product

ID$,$ product name, and the unit price. Note the two methods can be used to validate the

reading from the two $.$txt files associated with the customers and products.

NOTE you are allowed to add extra attributes and methods in this class if these attributes and

methods make your program more efficient.

Operations

Class Operations

This can be considered the main class of your program. It supports a menu with the following options:

i$.$ Make a purchase: this option allows users to make a purchase for a customer. Detailed

requirements for this option are below $($Requirements v$-$ix$).$

ii$.$ Display existing customers: this option can display all the information of all existing customers:

ID$,$ name, reward rate, discount rate $($only for VIP customers$),$ and reward.

iii. Display existing products: this option can