A-LevelComputer ScienceSoftware development9618/23 · Oct/Nov 2023 · Q56 Marks
A global 1D array of integers contains four elements, which are assigned values as shown: Mix[1] ← 4 Mix[2] ← 2 Mix[3] ← 3 Mix[4] ← 5 A procedure Process() manipulates the values in the array. The procedure is written in pseudocode as follows: PROCEDURE Process(Start : INTEGER) DECLARE Value, Index, Total : INTEGER Index ← Start Total ← 0 WHILE Total < 20 Value ← Mix[Index] Total ← Total + Value IF Index < 4 THEN Mix[Index] ← Mix[Index] + Mix[Index+1] ELSE Mix[Index] ← Mix[Index] + Mix[1] ENDIF Index ← (Value MOD 4) + 1 ENDWHILE Mix[1] ← Total * Index ENDPROCEDURE Complete the trace table on the opposite page by dry running the procedure when it is called as follows: CALL Process(2) [Trace table with columns: Index, Value, Total, Mix[1], Mix[2], Mix[3], Mix[4]]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.
- 6 MP1 Row 1 (initialisation)
- 6 Each iteration (1 – 5):
- 6 MP2 1 – Total 2
- 6 MP3 2 – Total 5
- 6 MP4 3 – Total 10
- 6 MP5 4 – Total 15
- 6 MP6 5 – Total 28 and final Mix[1] = 56
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