A-LevelComputer ScienceProgramming9618/31 · May/June 2021 · Q28 Marks

Describe the purpose of a user-defined data type.

(a)Describe the purpose of a user-defined data type.[2]
(b)(i)Define, using pseudocode, the following enumerated data types: (i) SchoolDay to hold data about the days students are usually in school.[1]
(b)(ii)(ii) WeekEnd to hold data about the days that are not school days.[1]
(c)Define, using pseudocode, the composite data type ClubMeet. This will hold data about club members that includes: • first name and last name • the two days they attend: o one on a school day o one not on a school day. Use the enumerated types you created in part (b).[4]

Mark scheme

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

[1] (a) To create a new data type (from existing data types)
[1] (a) To allow data types not available in a programming language to be constructed // To extend the flexibility of the programming language
[1] (b)(i) TYPE SchoolDay = (Monday, Tuesday, Wednesday, Thursday, Friday)
[1] (b)(ii) TYPE WeekEnd = (Saturday, Sunday)
[1] (c) TYPE ClubMeet and ENDTYPE correct
[1] (c) DECLARE FirstName and DECLARE LastName included with correct data types
[1] (c) DECLARE Schoolday included with correct data types from part 2(b)(i)
[1] (c) DECLARE Weekend included with correct data types from part 2(b)(ii)

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