O-LevelComputer ScienceProgramming2210/21 · May/June 2024 · Q29 Marks

Four descriptions of programming concepts and five programming concepts are shown.

(a)Draw one line to link each description to the most appropriate programming concept. Not all programming concepts will be used. [Description table and Programming concept table][4]
(b)Write the pseudocode to use a procedure named Average that passes the values 25 and 50 to the procedure.[2]
(c)Outline the role of procedures and functions in creating a program that is easier to maintain.[3]

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Mark scheme

Marking points from the official mark scheme (May/June 2024). The mark or mark type is shown in brackets.

[4] (a) One mark for each correct line a subroutine that may not return a value -> procedure; a value that is declared and used within a specific procedure -> local variable; a value that a procedure expects you to supply when it is called -> parameter; a subroutine that will always return a value -> function
[2] (b) One mark per mark point • Correct key word - CALL • Procedure name with correct parameters - Average (25, 50) CALL Average(25, 50)
[3] (c) One mark per mark point, max three • Procedures / functions divide the program into smaller manageable segments • making it more readable / easier to understand / easier to debug Procedures / functions with meaningful names help to provide documentation for the program / enable/help/provide abstraction • Procedures and functions may be re-used (in the program / in other programs / as part of a library) / run from a single line • Procedures and functions can reduce / eliminate (repeated) code

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