Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Why are LR parsers a better option than LL parsers?
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All these options are correct
LR parsers can be constructed to recognize nearly all
LR-parsing is the most general non-backtracking, shift-reduce method known, yet can be implemented relatively efficiently.
LR parsing can detect a syntactic error as soon as possible
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Why are LR parsers a better option than LL parsers?
Group of answer choices
All these options are correct
LR parsers can be constructed to recognize nearly all programming-language constructs for which CFGs exist.
LR-parsing is the most general non-backtracking, shift-reduce method known, yet can be implemented relatively efficiently.
LR parsing can detect a syntactic error as soon as possible
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- Differentiate between top-down and bottom-up parsing methods using a typical grammararrow_forwardFor the following formal grammar: * ::= 0 | 0 ::= | :: | ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ::= a | b |c|d|e|f|... |x|y|z Which of the following statements are syntactically valid? 0 1a 000 abco 01010010001zarrow_forwardb) Write the CFG for the following language over alphabet Σ= {p,q ,r} L={ pqr, ppqrr, pppqrrr, ppppqrrrr, pppppqrrrrr, ……………..} Hint : pn q rn where n>=1 Note: derive at least four strings for the given CFGarrow_forward
- Detailed and correct answer will be Upvoted else downvoted. Thank you!arrow_forwardAssignment 1. Design Push Down Automata for the following language, Consider E= {a,b} L= {w | w is a string of (a,b)* where number of 'a' and number of 'b' is not equal} Hints: The string can contain 'a andb' in any combination (star * operation). But the number of 'a' and 'b' will be unequal in the accepted string. Some example strings: aabbababa, bbbaabaabbbb, bababababab, aaaaaaaba etc.arrow_forwardAutomata 1. PDAs are not better than Turing machines. True False 2. A property that confirms If a set of regular languages are combined using an operator, then the resulting language is also regular is called: Open property Closure property Clean property Clear propertyarrow_forward
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