A program is being developed to implement a customer loyalty scheme for a coffee shop. The programmer has decided that the following data items need to be stored for each customer: | Data item | Description | |:------------|:--------------------------------------------------------------------------| | customer ID | a unique six-digit string | | points | an integer value that is increased by one for every cup of coffee the customer orders | When a customer visits the shop and orders coffee, the scheme operates as follows: • The total number of points is increased by the number of coffees ordered. • If just one cup of coffee is ordered and the number of points goes above 10, then: ○ the cup of coffee they have just ordered is given to them free of charge ○ the number of points is reduced by 11. • If the order is for multiple coffees and the number of points goes above 10, then: ○ they get one coffee free of charge for every 11 points ○ the number of points is reduced by 11 for each free coffee. For example, the: • customer currently has 9 points • customer orders 16 cups of coffee • total number of points now becomes 25 • customer gets 2 free coffees and now has 3 points left. The programmer has defined a program module that is called every time a customer places an order: | Module | Description | |:---------------|:-----------------------------------------------------------------| | CustomerOrder()| • called with two integer parameters: ○ the number of coffees ordered ○ the current number of points • output a suitable message giving the number of free coffees • return a value for the new points total.

1. (a)Write pseudocode for module CustomerOrder()[6]
2. (b)(i)A text file Loyalty.txt will be used to store the data items for the loyalty scheme. The data items for each customer will be stored on a separate line of the text file where each data item is separated by a comma: <CustomerID>, <Points> The contents of the text file Loyalty.txt will always be stored in ascending order by customer ID. When the data items are read from or written to the text file Loyalty.txt, they may need to be converted to the appropriate data type. Each customer has a unique customer ID starting at "100001" with this value increasing by one each time a new customer joins the loyalty scheme. When a customer joins the loyalty scheme, they are assigned the next customer ID and value of points is set to 0. For example, if the loyalty scheme has 204 customers and a new customer joins the loyalty scheme, the following line is added to the text file Loyalty.txt: "100205,0" You can assume that the number of customers in the loyalty scheme will never be more than 9000. The programmer has defined a program module as follows: | Module | Description | |:-------------------|:-----------------------------------------------------------------------| | AddNewCustomers() | • called with an integer parameter representing the number of new customers to be added to the loyalty scheme | | | • adds a new line, containing the required information, to the text file Loyalty.txt for each customer added to the loyalty scheme | | | • outputs each new customer ID added to the loyalty scheme | Write pseudocode for module AddNewCustomers() Assume that there is at least one customer already in the loyalty scheme.[8]
3. (b)(ii)The requirements for AddNewCustomers() are changed. There may be no existing customers in the loyalty scheme. Explain the changes that will need to be made to the module AddNewCustomers()[4]