A-LevelComputer ScienceProgramming9618/22 · Oct/Nov 2023 · Q56 Marks

A global 1D array of integers contains four elements, which are assigned values as shown: Mix[1] ← 1 Mix[2] ← 3 Mix[3] ← 4 Mix[4] ← 2 A procedure Process() manipulates the values in the array. The procedure is written in pseudocode: PROCEDURE Process(Start : INTEGER) DECLARE Value, Index, Count : INTEGER Index ← Start Count ← 0 REPEAT Value ← Mix[Index] Mix[Index] ← Mix[Index] - 1 Index ← Value Count ← Count + 1 UNTIL Count = 5 Mix[4] ← Count * Index ENDPROCEDURE Complete the trace table on the opposite page by dry running the procedure when it is called as follows: CALL Process(3)

Complete the trace table on the opposite page by dry running the procedure when it is called as follows: CALL Process(3)[6]

Mark scheme

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

[6] One mark for:
Initialisation row
Each iteration of Count 1 to 4 with correct Index, Count and array Mix as shown
Final iteration, Count = 5, correct Index, Count and array Mix as shown plus Mix[4] assignment

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Topic: Programming, A-Level Computer Science (syllabus 9618). Structured question, 6 marks.
Source: A-Level Computer Science, Oct/Nov 2023 Paper 2 Variant 2, question 5.

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