A-LevelComputer ScienceSoftware development9618/12 · May/June 2021 · Q78 Marks

Jennifer is writing a computer program for her A Level homework.

(a)Jennifer uses a program library to help her write her computer program. Describe how a program library can be used while writing a computer program.[2]
(b)(i)The IDE allows Jennifer to use both an interpreter and a compiler while creating her computer program. Describe the ways in which Jennifer can use both a compiler and an interpreter while developing the program.[4]
(b)(ii)Identify two debugging tools that a typical IDE can provide.[2]

Mark scheme

Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.

[1] (a) Program libraries store pre-written functions and routines
[1] (a) The program library can be referenced/imported
[1] (a) The functions/routines can be called in her own program
[1] (b)(i) (Interpreter) Use an interpreter while writing the program // to test/debug the partially completed program
[1] (b)(i) (Interpreter) because errors can be corrected and processing continue from where the execution stopped // errors can be corrected in real time // errors are identified one at a time
[1] (b)(i) (Compiler) Use the compiler after the program is complete // to create an executable file
[1] (b)(i) (Compiler) Use the compiler to repeatedly test the same (completed) section // without having to re-interpret every time // compiler not needed at run-time
[1] (b)(ii) Breakpoints
[1] (b)(ii) Single stepping
[1] (b)(ii) Report windows

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