O-LevelComputer ScienceProgramming2210/21 · May/June 2023 · Q64 Marks

State two features that should be included to create a maintainable program. Give a reason why each feature should be used.

State two features that should be included to create a maintainable program. Give a reason why each feature should be used. 1 2[4]

Mark scheme

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

[1] Feature: Meaningful identifiers
[1] Reason: to enable the programmer (or future programmers) to easily recognize the purpose of a variable / array / constant // to enable easy tracking of a variable / constant / array through the program
[1] Feature: Use of comments
[1] Reason: to annotate each section of a program so that a programmer can find specific sections / so that the programmer knows the purpose of that section of code
[1] Feature: Procedures and functions
[1] Reason: to make programs modular and easier to update / add functionality

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Topic: Programming, O-Level Computer Science (syllabus 2210). Structured question, 4 marks.
Source: O-Level Computer Science, May/June 2023 Paper 2 Variant 1, question 6.

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