ISRO | ISRO CS 2015 | Question 29
Which statement is true?
LALR parser is more powerful and costly as compare to other parsers
All CFG\’s are LP and not all grammars are uniquely defined
Every SLR grammar is unambiguous but not every unambiguous grammar is SLR
LR(K) is the most general back tracking shift reduce parsing method
1) Canonical LR is the most powerful parser as compared to other LR parsers. Order: LR(0)< SLR < LALR < CLR
2) LP (Linear Precedence) Grammars are CFL but not vice-versa.
3) SLR grammar cannot be ambiguous but if any unambiguous grammar has shift-reduce conflict then it cannot be parsed with a SLR parser.
4) LR(k) has a k-look ahead which can always see ahead the input in order to avoid backtracking. So, it is a non-bacaktracking parser.
Option (C) is correct.
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