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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2017/imperative-programming/7/a/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2017 / Imperative programming / 7 / a / Solution by

Codex  0 2026-10-31

The three printed lines are:

g in A, f in C
h in B, f in A
k in A, h in B, f in A

The inherited A.g makes an ordinary virtual call to f, selecting C.f by dynamic dispatch. B.h instead invokes super.f, which selects the next implementation after B, namely A.f. Finally, A.k makes an ordinary virtual call to h, selecting B.h and its already determined result. A super call is not redirected back to the most-derived override.

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