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Homework2

# Homework2 - the program Also format the program by writing...

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COP 5555 Programming Language Principles Homework 2 Assigned: May 25, 2011 Deadline: 11:59pm June 1, 2011 *Note: Please submit your solution to the e-learning system by the deadline. No late submission is allowed. 1. Problem 1 (25 Points) Consider the following grammar: A -> B (',' B)+ => "a" -> B B -> B '&' C => "b" -> C C -> D '#' C => "c" -> D D -> <identifier> Write the skeleton of a recursive descent parser for this grammar, including 'BuildTree' statements that will build the AST bottom-up, for the original grammar. Hint: See Powerpoint lecture 6. 2. Problem 2 (25 Points) The following RPAL program is overly parenthesized; remove all superfluous parentheses, i.e. minimize the parentheses without changing the meaning of

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Unformatted text preview: the program. Also, format the program by writing it on several lines with the appropriate indentation. let (x =((a * b)-c)) in ((e & f) -> (g -> x ** (x**2)|y) | (f(x) where (( f(y) = (y*2)) and (x=(2 + (x ** 2)))))) 3.Problem 3 (25 Points) Write, test, and debug an RPAL program that computes the "tuple reverse" function: Rev(4,'hello',(3,4),true) = (true,(3,4),'hello',4). Please write them on several lines with the appropriate indentation. 4. Problem 4 Explain the behavior of the following RPAL program, and the type of each identifier which appeared: Let Prod N = P 1 N where rec P Cum N = N eq 1 -> Cum | P (Cum*N) in Print (Prod 5 4 3 2 1) Make an honest agempt at fiGurinG it out BEFORE askinG the RPAL interpreter....
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