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comp_314_quiz_10 - http/cs.bilgi.edu.tr Name Surname...

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http://cs.bilgi.edu.tr Name Surname . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Number (ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Comp 314 — Quiz ( Week 10) Do not use pencil to write your answers. Use only black or dark blue indelible pen. Cross through errors with a single line. Question 1 40 Marks In chapter 8 of PLAI, the Scheme construct box is introduced. 1. What is box? 2. What operations can be performed on box and what are their semantics? 3. Implement box in Scheme without using the built-in box. 4. Why did we need to introduce this construct in chapter 8? 5. When and how do we use it in the chapter 8 interpreter? Document last compiled on April 27, 2009 1
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http://cs.bilgi.edu.tr Question 2 10 marks Why, in practice, do lazy languages generally not have mutation? Explain what might go wrong if they did, giving examples. Document last compiled on April 27, 2009 2
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http://cs.bilgi.edu.tr Question 3 10 marks “Since lazy languages evaluate expressions later, instead of immediately, the expres-
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