Data types & arithmetic operations (DIV, MOD) – GCSE Computer Science exam questions with mark scheme

1Grade 1–34 marks

A cinema booking program stores the data below. State the most appropriate data type for each item. [4]

(a) The number of seats booked
(b) The price of a ticket, e.g. 7.50
(c) Whether the customer has paid
(d) The customer's postcode

(a) Integer; accept int(1)
(b) Real (accept float)(1)
(c) Boolean; accept bool(1)
(d) String; accept str; reject character / char(1)
Answer: (a) Integer (b) Real (c) Boolean (d) String
Examiner tip: A postcode mixes letters, digits and spaces, so it is a string – it is not an integer just because it contains numbers. Use the spec's data-type names (integer, real, Boolean, character, string).

2Grade 1–34 marks

(a) State the result of 17 DIV 5. [1]

(b) State the result of 17 MOD 5. [1]

(d) A two-dimensional array is declared as:

grid ← [[3, 8, 1], [6, 2, 9]]

State the value of grid[1][2]. [1]

(a) 3(1)
(b) 2(1)
(c) n MOD 2 = 0 (accept equivalent, e.g. n MOD 2 ≠ 1)(1)
(d) 9(1)
Answer: (a) 3 (b) 2 (c) n MOD 2 = 0 (d) 9
Examiner tip: Arrays in AQA pseudocode start at index 0, so grid[1] is the second row.

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