A-LevelComputer ScienceFurther programming9618/31 · Oct/Nov 2023 · Q118 Marks

A declarative programming language is used to represent subjects that students can choose to study. Students must choose two subjects. [List of clauses 01-21, e.g., '01 subject(mathematics).', '09 student(tomaz).', '15 choice1(tomaz, mathematics).'] These clauses have the meanings: [Table mapping Clause numbers to Meaning]

(a)Anthony is a student who would like to study history and geography. Write additional clauses to represent this information. 22 23 24[3]
(b)Using the variable X, the goal: choice1(X, chemistry) returns X = teresa, elspeth Write the result returned by the goal: choice1(X, mathematics) X = [1]
(c)Students must choose two different subjects such that: N may choose S, if N is a student and S is a subject and N has not chosen S as the first choice. Write this as a rule. may_choose_subject(N, S) IF[4]

Mark scheme

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

[1] One mark for each correctly completed clause (Max 3) (22) student (anthony).
[1] (23) choice1 (anthony, history).
[1] (24) choice2(anthony, geography).
[1] X = tomaz, pietre, nico
[1] One mark per mark point (Max 4) student (N)
[1] subject (S)
[1] choice1 (N, S)
[1] all logical operators correct with no additional code (see example answers)
[1] Example answers: may_choose_subject(N, S) IF student(N) AND subject(S) AND NOT choice1(N, S)
[1] may_choose_subject(N, S) IF NOT choice1(N, S), student(N), subject(S)

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