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CSE340Fall2009FinalExam

CSE340Fall2009FinalExam - Arizona State University Ira A...

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Arizona State University Ira A. Fulton College of Engineering Computer Science and Engineering CSE 340 Fall 2009 FINAL EXAM State any assumptions you make. TOTAL ________ 84 Write legibly . If I cannot read what you write, I cannot grade it! Question0. [1 point] Write your name! Question 1. [6 points] Consider the following EBNF grammar. P ( P ) P ( P ) P P ( ) P P → ( ) 1. Write a recursive descent parser for this grammar. Pseudecode is OK. You can assume that your input is terminated with an EOF character (end of file).
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Question 2. [6 points] Consider the following program int a; int p() { /* point 1 */ a = 2; return a; } int q() { int a, q; a = 3; q = p(); q = q+a; return q; } Void main() { a = 2; Print(“%d”, q ()); } Assume that dynamic scoping is in use. 1. On the diagram below, fill in the blanks and specify parent scope of every function and current scope at execution point 1. 2. What value is printed by this program? a b main p q
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Question 3. [ 7 points] Consider the following BNF grammar P ( P ) P P P P → ( ) Draw a parse tree for the string (())(). Show that the grammar is ambiguous.
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Question 4. [6 points]
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