The manager of a supermarket needs a program to record donations to charity. Each customer has the choice of three charities to donate to, and 1% of their shopping bill will be donated to the chosen charity. Write and test a program for the manager. • Your program must include appropriate prompts for the entry of data. • Error messages and other output need to be set out clearly. • All variables, constants and other identifiers must have meaningful names. You will need to complete these three tasks. Each task must be fully tested. TASK 1 – Set up the donation system Set up a routine that allows: • the names of three charities to be input and stored • the charity names to be displayed with a number (1, 2 or 3) beside each name • a choice of 1, 2 or 3 to be entered to choose the charity, all other entries rejected • the value of a customer’s shopping bill to be entered • the donation to be calculated • three totals to be set to zero ready to total each charity donation TASK 2 – Record and total each donation For a customer’s shopping bill: • input a charity choice of 1, 2 or 3 • input the value of a customer’s shopping bill • calculate the donation • add the donation to the appropriate total Output the name of the charity and the amount donated. TASK 3 – Show the totals so far Extend TASK 2 to accept: • donations from more customers • a charity choice of -1 to show the totals so far Display the charities’ names and the totals in descending order of totals. Calculate a grand total of all three totals. Output ‘GRAND TOTAL DONATED TO CHARITY’ and the amount of the grand total.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.

1. [3] (a) (i) Many correct answers, they must be meaningful. This is an example only.
2. – Choice, integer, choice of charity
3. – Cost, real, cost of shopping
4. – Donation, real, donation calculated from cost of shopping
5. [3] (a) (ii) - Array // a set of (similar) variables grouped together// description or array declaration applied to the scenario e.g. DonationTotals[1:3] // allows for more efficient programing e.g. use of indices//each charity total can be identified by an index
6. or
7. - List // a set of variables grouped together// description or list declaration applied to the scenario e.g. DonationTotals[] // allows for more efficient programing e.g. use of a loop to update each charity
8. or
9. - Variables // storage locations that can be changed// description or declaration applied to the scenario e.g. DonationTotal1, DonationTotal2 and DonationTotal3 // e.g. as there are only 3 charities so there is no need to use an array
10. [5] (b) Any five from:
11. Prompt for input of charity choice // prompt for input of value of shopping
12. input charity choice
13. check for input of 1, 2, or 3
14. input value of shopping
15. calculate donation
16. add donation to the appropriate total
17. output name of charity and amount/total amount donated
18. Sample Answer.
19. REPEAT
20. PRINT 'Please enter choice of charity 1, 2. or 3 '
21. INPUT Choice
22. UNTIL Choice = 1 or Choice = 2 or Choice = 3
23. PRINT 'Please enter value of shopping bill '
24. INPUT BillValue
25. Donation ← BillValue * 0.01
26. Total (Choice) ← Total (Choice) + Donation
27. PRINT 'Charity ', CharityName (Choice), ' has received a donation of ', Donation
28. [6] (c) Maximum six marks in total for question part
29. Description (may include reference to program statements)
30. – when charity choice = -1
31. – display total donation for each charity ...
32. – ... with corresponding charity name...
33. – description of method for selecting descending order of totals
34. – evidence that the method works
35. – calculate grand total from 3 totals / sum of all donations
36. – output 'GRAND TOTAL DONATED TO CHARITY' and grand total
37. [3] (d) Any three from:
38. input number of charities
39. store the number of charities as a variable
40. change the upper value of the choice input
41. change the array bounds for total donations etc.// add new variables to hold extra values
42. the need to change the code...
43. to allow for differing number of charities