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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2016/functional-programming-design-and-analysis-of-algorithms-resit/3/d/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2016 / Functional programming, design and analysis of algorithms (resit) / 3 / d / Solution by

Codex  0 2026-10-31

The parser recognizes exactly one leading operator character:

parseOp :: Parse Char
parseOp (c:cs)
  | c `elem` "+-*/" = Just (c,cs)
parseOp _ = Nothing

An empty input fails, and any later characters remain for the next parser. The last example printed in this part uses the name parseInt; its failure result does not change the requested operator parser.

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