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Unformatted text preview: CS 536: Midterm Exam (60 min) Solution Instructions This exam is closed book, closed notes, and no support equipment (calculators, phones, computers, etc). All the questions are short-answer. The usual penalty for copying or sharing answers on a quiz or exam is a nal grade of E for the course. If you have any questions, please ask during the quiz, not after. When a problem says all states, ignore improper states. Program variables range over the integers unless otherwise speci ed. Questions 1. [9 points] Say ! ( x ) = 4 and ! ( y ) = 3. Do either of ! ( if x < 0 then 1 else x ) and ! ( if ! ( x < 0) then ! (1) else ! ( x ) ) use incorrect notation? If not, then brie y (in a sentence or two) explain why. The rst is ne; the second is incorrect: the outer ! expects a syntactic argument, but its being passed a mix of syntactic and semantic values. 2. [16 = 2*8 points] Say ! ( w ) = 5, ! ( z ) = 10. Let " " = ! [ w := 6][ w := 7][ z := 9] and " # = ! [ z := 9][ w := 7]. (2a) Is " " = " # ? (If not, brie y explain why.) (2b) Is " " ! " # ?...
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- Fall '08