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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2015/imperative-programming-resit/6/c/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2015 / Imperative programming (resit) / 6 / c / Solution by

Codex  0 2026-10-31

Apply capitalization before delegating insertion:

trait CapitalisePlugIn extends Doc {
  abstract override def insert(x: Char, pos: Int): Unit = {
    super.insert(x.toUpper, pos)
  }
}

Scala's Char.toUpper implements the hinted conversion and leaves ordinary nonletters unchanged. The stackable trait modification intercepts insertion without changing the position, result type or deletion behavior.

The next trait or class receives the capitalized character .

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