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Which of the following statements is/are correct?
A. SLR parser is more powerful than LALR parser.
B. Canonical LR parser is more powerful than LALR parser.
C. LALR parser is more powerful than Canonical LR parser.
  • a)
    Only A
  • b)
    Only B
  • c)
    A and B
  • d)
    A, B and C
Correct answer is option 'B'. Can you explain this answer?
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Which of the following statements is/are correct?A. SLR parser is more...
Concept:
Statement A: SLR parser is more powerful than LALR parser.
False, LALR(1) parser is more powerful than SLR(1) and LR(0) parser. LALR offers a good solution, because LALR(1) grammars are more powerful than SLR(1), and can parse most practical LL(1) grammars. LR(1) grammars are more powerful than LALR(1).


Statement B: Canonical LR parser is more powerful than LALR parser.
True, Canonical LR parser is more powerful than LALR parser. The number of states in the parsing automaton differs between the CLR and LALR algorithms. CLR parsers have a much larger number of states than LALR parsers.
Statement C: LALR parser is more powerful than Canonical LR parser.
False, Canonical LR parser is more powerful than LALR parser. Canonical (CLR) is the most powerful Parsers among all the LR(k) Parsers or SLR.
Hence the correct answer is Only B.
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