A-LevelComputer ScienceProgramming9618/21 · May/June 2025 · Q112 Marks

A program is being developed to help the manager of a shop control the stock.

(a)An identifier table has been used during the design stage. Complete the identifier table: Example value Explanation Variable name Data type "Fruit" a category of stock that is sold in the shop 20/02/2025 when an item was sold 12.67 the cost of an item TRUE to indicate if an item is in stock[4]
(b)A module Sales () is part of the stock control program. The table contains pseudocode extracts from the module Sales() Each extract may include all or part of: • assignment • selection • iteration (repetition). Complete the table by placing one or more ticks (✔) in each row: Pseudocode extract Assignment Selection Iteration Result ← CalculateTotal() WHILE IsClosed REPEAT INPUT Value UNTIL Sales[4] > Value IF Sales[Current] <= 150 THEN Discount ← TRUE ENDIF CASE OF Option[5]
(c)Decomposition has been used to design the program to help the shop manager control the stock. Describe decomposition.[3]

Mark scheme

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

[4] Category STRING
[4] DateSold DATE
[4] (Item)Cost/Price REAL
[4] (Item)InStock BOOLEAN
[1] Result ← CalculateTotal() Assignment: ✔
[1] WHILE IsClosed Iteration: ✔
[1] REPEAT ... UNTIL Sales[4] > Value Assignment: ✔ Iteration: ✔
[1] IF Sales(Current) <= 150 THEN ... ENDIF Selection: ✔
[1] CASE OF Option Selection: ✔
[1] Breaking down a problem into sub problems
[1] In order to explain / understand the process/task of how a (stock control) can be managed in more detail
[1] Leading to the concept of the program designed as a series of modules / procedures / functions // or by example of different stock control modules
[1] Makes the program easier to test / debug

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