Concepts of Programming Languages (11th Edition)
11th Edition
ISBN: 9780133943023
Author: Robert W. Sebesta
Publisher: PEARSON
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Expert Solution & Answer
Chapter 4, Problem 15RQ
Explanation of Solution
Top-down Parser:
A grammar which has the following characteristics cannot be used as the basis for a top-down parser:
1) A grammar with direct or indirect left recursion.
2) A grammar which fails in pairwise disjointness test.
1) A grammar with direct or indirect left recursion:
- Example for grammar with direct left recursion: AA+B, where in a rule for a particular non terminal, the non-terminal on the LHS comes on the leftmost symbol on its RHS too.
- Example for grammar with indirect left recursion: - ABaA, AAb, where in a rule for a particular non terminal, the non-terminal comes as the leftmost symbol on its RHS can be expanded to get a string which in turn can be expanded (using rule for the left most symbol) to get that particular non terminal itself on the left most part.
In a grammar with left recursion, the first non-terminal when expanded from RHS we get the same non terminal of LHS in the grammar rule directly or indirectly. In a top down parsing since the next sentential form is obtained by expanding the left most non terminal, presence of left recursion results in indefinite recursive calls...
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Chapter 4 Solutions
Concepts of Programming Languages (11th Edition)
Ch. 4 - Prob. 1RQCh. 4 - Prob. 2RQCh. 4 - Prob. 3RQCh. 4 - Prob. 4RQCh. 4 - Prob. 5RQCh. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Prob. 8RQCh. 4 - Prob. 9RQCh. 4 - Prob. 10RQ
Ch. 4 - Prob. 11RQCh. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Prob. 15RQCh. 4 - Prob. 16RQCh. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - Prob. 19RQCh. 4 - Prob. 20RQCh. 4 - Prob. 21RQCh. 4 - Prob. 22RQCh. 4 - Prob. 23RQCh. 4 - What was Knuths insight in developing the LR...Ch. 4 - Prob. 25RQCh. 4 - Prob. 26RQCh. 4 - Is left recursion a problem for LR parsers?Ch. 4 - Prob. 1PSCh. 4 - Prob. 2PSCh. 4 - Prob. 3PSCh. 4 - Prob. 4PSCh. 4 - Prob. 7PSCh. 4 - Prob. 8PS
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