A-LevelComputer ScienceData types and structures9618/21 · Oct/Nov 2025 · Q39 Marks

A program is needed to manage individual rentals in a car-hire business. The data items for each rental will be held in a record structure of type RentalRecord The programmer has started to define the items that will be needed: Item Example value Comment RentalID "AB1234" a unique alpha-numeric value CarID 241 a numeric value used as an array index DisCode 'S' a letter indicating the type of discount offered Start 13/06/2025 when the rental starts Duration 7 the number of days of the rental Completed FALSE TRUE when the car is returned and the rental charge paid

(a)(i)Write pseudocode to declare the record structure for type RentalRecord[4]
(a)(ii)A 1D array Rental containing 500 elements is used to store the data for all rental records. Write pseudocode to declare the Rental array.[2]
(b)State three benefits of using an array of records to store the data for all rentals.[3]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.

[4] (a)(i) One mark for TYPE RentalRecord and ENDTYPE statements
[4] (a)(i) One mark for RentalID and CarID declared correctly
[4] (a)(i) One mark for DisCode and Start declared correctly
[4] (a)(i) One mark for Duration and Completed declared correctly
[2] (a)(ii) DECLARE Rental : ARRAY[1:500] OF RentalRecord
[3] (b) Different data types held (for each rental) under a single identifier
[3] (b) Allows for iteration through rentals/records // Can access rentals/records in a loop // Can (directly) access a specific rental/record using an (array) index
[3] (b) Simplifies the code/program / less code needed / reduces code duplication // Makes code/program easier to understand // Makes testing / debugging easier // Program maintenance easier

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