A-LevelComputer ScienceFurther programming9618/23 · Oct/Nov 2023 · Q47 Marks

A procedure RandList() will output a sequence of 25 random integers, where each integer is larger than the previous one.

(a)Write pseudocode for procedure RandList().[6]
(b)Procedure RandList() is modified so that the random numbers are also written into a 1D array Result. A new module is written to confirm that the numbers in the array are in ascending order. This module contains an IF statement that performs a comparison between elements: IF (Result[x + 1] = Result[x]) OR (Result[x] > Result[x + 1]) THEN Sequence ← FALSE ENDIF Write a simplified version of the conditional clause.[1]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.

6 (a) MP1 Procedure heading and ending
6 (a) MP2 Local loop counter Count as integer
6 (a) MP3 Loop to iterate 25 times or more for each unique number
6 (a) MP4 'Attempt' to generate a random number including use of INT () in a loop
6 (a) MP5 Ensure that number generated is greater than previous and change 'previous'
6 (a) MP6 Output random number after an attempt at MP5 in a loop
1 (b) MP1 Result[x + 1] <= Result[x]
1 (b) ALTERNATIVE SOLUTION: Result [x] >= Result (x + 1]

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