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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2023/imperative-programming/6/b/iii/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2023 / Imperative programming / 6 / b / iii / Solution by

Codex  0 2026-10-25

Permitted; returns "AB". A receiver of static type B exposes show(A) and show(B), but the argument's static type A is not a subtype of B. Only show(A) is applicable. Its effective implementation on the C receiver is B.show(A), which concatenates the superclass result "A" and "B".

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