CONCEPTS OF PROGRAMMING LANG.-TEXT
11th Edition
ISBN: 2810017678981
Author: Sebesta
Publisher: PEARSON
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Chapter 4, Problem 9RQ
Explanation of Solution
Differences between top-down and bottom-up parsers:
The differences between top-down and bottom-up parsers are as follows:
- Top down parser and bottom up parser differ in the way in which a parse tree is built. We know that a tree contains a special node called root which specifies the entry to the tree, some internal nodes and terminal nodes called leaves.
- If the parser starts building the tree from root (top), gradually expands down from root to leaves (ends at down part) it is the top-down approach and such a parser is called top-down parser.
- If the parser starts from leaf nodes(from down) and slowly builds up towards the root node, then the approach is called bottom up parsing method and such a parser is called bottom up parser.
- Top-down parser builds tree in pre-order where node root is first built and then it’s left branch and then its right branch where as a bottom up parser builds the tree starting from leaves and reach the root in upwards direction...
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Outline the steps performed by the driver of a bottom-up parser.
Describe the differences between top-down and bottom-up parsers.
Describe the activities that are carried out by the driver of a bottom-up parser.
Chapter 4 Solutions
CONCEPTS OF PROGRAMMING LANG.-TEXT
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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Similar questions
- What is the mathematical machine on which both -top--down and -bottom--up parsers are based?arrow_forwardShift-Reduce parsers are: Chose the correct anwser below: Maybe top down or bottom up parsers Top-down parsers Can never be bottom-up parsers Bottom-up parsersarrow_forwardOutline the steps followed by the engine behind a bottom-up parser.arrow_forward
- Describe the activities done by the driver of a bottom-up parser.arrow_forwardTop-down parsers require the language developer to develop a parsing table. True Falsearrow_forwardUse as many examples as possible to support your viewpoint. Which kind of parser is more powerful, bottom-up or top-down?arrow_forward
- Chomsky Normal Form: Most useful grammars can be translated into a nor-mal form making answers to questions about the language more transparent.arrow_forward10. A. top-down C. syntax directed Cancel RESET _parser cannot handle left recursive grammar fy A © B. bottom up none of the above D. Donearrow_forwardComputer Science Write the parser code in java to implement the cky parsing(bottom up approach) A. Input to the parser: a sentence at a time B. Output from the parser: Yes/No (to indicate the sentence is accepted and valid, or not accepted and invalid)arrow_forward
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