Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Which of the following statements is true?a)S...
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Which of the following statements is true?
- a)SLR parser is more powerful than LALR.
- b)IALR parser is more powerful than Canonical LR parser.
- c)Canonical LR parser is more powerful than LALR parser.
- d)The parsers SLR, Canonical GR, and LALR have the same power.
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Which of the following statements is true?a)SLR parser is more powerfu...
The canonical LR parser is the most powerful parser that can recognize more grammars than other parsers.
Most Upvoted Answer
Which of the following statements is true?a)SLR parser is more powerfu...
Explanation:
Parsing is the process of analyzing a given input sequence in order to produce a parse tree. There are different types of parsers available for parsing, among which SLR, Canonical LR, LALR, and IALR are some of the widely used parsers.
Canonical LR Parser:
- Canonical LR parser is a bottom-up parser that uses a canonical collection of LR(1) items to parse an input sequence.
- It can handle a larger class of grammars than the SLR and LALR parsers.
- It can parse all LR(1) grammars.
LALR Parser:
- LALR parser is also a bottom-up parser that uses a lookahead LR(1) parsing table to parse an input sequence.
- It is more efficient and faster than the Canonical LR parser.
- It can handle a large class of grammars, but not all LR(1) grammars.
SLR Parser:
- SLR parser is a simple bottom-up parser that uses a parse table constructed from an LR(0) state machine to parse an input sequence.
- It is the simplest and fastest of all LR parsers but can handle only a subset of LR(1) grammars.
IALR Parser:
- IALR parser is a hybrid parser that combines the features of both LALR and Canonical LR parsers.
- It can parse all LR(1) grammars and is more efficient than the Canonical LR parser.
Conclusion:
- Among the given options, option C is true, which states that Canonical LR parser is more powerful than LALR parser as it can handle a larger class of grammars than the LALR parser.
- SLR parser is less powerful than both LALR and Canonical LR parsers.
- IALR parser is more powerful than Canonical LR parser as it combines the features of both Canonical LR and LALR parsers.
Parsing is the process of analyzing a given input sequence in order to produce a parse tree. There are different types of parsers available for parsing, among which SLR, Canonical LR, LALR, and IALR are some of the widely used parsers.
Canonical LR Parser:
- Canonical LR parser is a bottom-up parser that uses a canonical collection of LR(1) items to parse an input sequence.
- It can handle a larger class of grammars than the SLR and LALR parsers.
- It can parse all LR(1) grammars.
LALR Parser:
- LALR parser is also a bottom-up parser that uses a lookahead LR(1) parsing table to parse an input sequence.
- It is more efficient and faster than the Canonical LR parser.
- It can handle a large class of grammars, but not all LR(1) grammars.
SLR Parser:
- SLR parser is a simple bottom-up parser that uses a parse table constructed from an LR(0) state machine to parse an input sequence.
- It is the simplest and fastest of all LR parsers but can handle only a subset of LR(1) grammars.
IALR Parser:
- IALR parser is a hybrid parser that combines the features of both LALR and Canonical LR parsers.
- It can parse all LR(1) grammars and is more efficient than the Canonical LR parser.
Conclusion:
- Among the given options, option C is true, which states that Canonical LR parser is more powerful than LALR parser as it can handle a larger class of grammars than the LALR parser.
- SLR parser is less powerful than both LALR and Canonical LR parsers.
- IALR parser is more powerful than Canonical LR parser as it combines the features of both Canonical LR and LALR parsers.
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Which of the following statements is true?a)SLR parser is more powerful than LALR.b)IALR parser is more powerful than Canonical LR parser.c)Canonical LR parser is more powerful than LALR parser.d)The parsers SLR, Canonical GR, and LALR have the same power.Correct answer is option 'C'. Can you explain this answer?
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