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Which of the following intuitive definition is true about LR(1) Grammar.
- a)For a grammar to be LR(1) it is sufficient that a left-to-right shift reduce parser be able to recognize handles of right-sentential form when they appear on the stack.
- b)For a grammar to be LR(1) it is sufficient that a left-to-right shift reduce parser be able to recognize handles of left-sentential form when they appear on the stack.
- c)For a grammar to be LR(1) it is sufficient that a left-to-right shift reduce parser be able to recognize handles of left-sentential form or right-sentential form when they appear on the stack.
- d)All of the above
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Which of the following intuitive definition is true about LR(1) Gramma...
LR(1) – Reading the input string from left to right.
LR(1) – Deriving a right-most derivation for the string.
LR(1) – one token look-ahead
In the first choice we read from Left to right deriving the right-most sentential form and looking one symbol ahead which is stack top. So option (a) is correct.
LR(1) – Deriving a right-most derivation for the string.
LR(1) – one token look-ahead
In the first choice we read from Left to right deriving the right-most sentential form and looking one symbol ahead which is stack top. So option (a) is correct.
Most Upvoted Answer
Which of the following intuitive definition is true about LR(1) Gramma...
Intuitive definition of LR(1) Grammar
Explanation:
In computer science, LR(1) grammar is a type of context-free grammar that can be parsed using an LR(1) parser. The LR(1) parser is a shift-reduce parser that uses a single lookahead symbol to make parsing decisions.
The intuitive definition of LR(1) grammar states that it is sufficient for a left-to-right shift-reduce parser to be able to recognize handles of right-sentential form when they appear on the stack.
Explanation of Option A:
Option A states that for a grammar to be LR(1), it is sufficient for a left-to-right shift-reduce parser to be able to recognize handles of right-sentential form when they appear on the stack.
- A handle is a substring that matches the right-hand side of a production, and it represents a portion of the input that has been successfully reduced to a non-terminal symbol.
- A right-sentential form is a sentential form in which all the reductions have been made from the right end.
- The stack is a data structure used by the parser to store symbols during the parsing process.
The intuitive definition in option A is true because an LR(1) parser uses a single lookahead symbol to determine its actions. By recognizing handles of right-sentential form when they appear on the stack, the parser can perform reductions and shift operations based on the current input symbol and the lookahead symbol. This allows the parser to correctly parse the input according to the grammar rules.
Explanation of Other Options:
Option B states that a grammar is LR(1) if a left-to-right shift-reduce parser can recognize handles of left-sentential form when they appear on the stack. This definition is not correct because an LR(1) parser does not specifically recognize handles of left-sentential form.
Option C states that a grammar is LR(1) if a left-to-right shift-reduce parser can recognize handles of left-sentential form or right-sentential form when they appear on the stack. This definition is not correct because an LR(1) parser primarily recognizes handles of right-sentential form.
Option D states that all of the above definitions are correct. This option is incorrect because options B and C are not correct definitions of LR(1) grammar.
Therefore, the correct answer is option A.
Explanation:
In computer science, LR(1) grammar is a type of context-free grammar that can be parsed using an LR(1) parser. The LR(1) parser is a shift-reduce parser that uses a single lookahead symbol to make parsing decisions.
The intuitive definition of LR(1) grammar states that it is sufficient for a left-to-right shift-reduce parser to be able to recognize handles of right-sentential form when they appear on the stack.
Explanation of Option A:
Option A states that for a grammar to be LR(1), it is sufficient for a left-to-right shift-reduce parser to be able to recognize handles of right-sentential form when they appear on the stack.
- A handle is a substring that matches the right-hand side of a production, and it represents a portion of the input that has been successfully reduced to a non-terminal symbol.
- A right-sentential form is a sentential form in which all the reductions have been made from the right end.
- The stack is a data structure used by the parser to store symbols during the parsing process.
The intuitive definition in option A is true because an LR(1) parser uses a single lookahead symbol to determine its actions. By recognizing handles of right-sentential form when they appear on the stack, the parser can perform reductions and shift operations based on the current input symbol and the lookahead symbol. This allows the parser to correctly parse the input according to the grammar rules.
Explanation of Other Options:
Option B states that a grammar is LR(1) if a left-to-right shift-reduce parser can recognize handles of left-sentential form when they appear on the stack. This definition is not correct because an LR(1) parser does not specifically recognize handles of left-sentential form.
Option C states that a grammar is LR(1) if a left-to-right shift-reduce parser can recognize handles of left-sentential form or right-sentential form when they appear on the stack. This definition is not correct because an LR(1) parser primarily recognizes handles of right-sentential form.
Option D states that all of the above definitions are correct. This option is incorrect because options B and C are not correct definitions of LR(1) grammar.
Therefore, the correct answer is option A.
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Which of the following intuitive definition is true about LR(1) Grammar.a)For a grammar to be LR(1) it is sufficient that a left-to-right shift reduce parser be able to recognize handles of right-sentential form when they appear on the stack.b)For a grammar to be LR(1) it is sufficient that a left-to-right shift reduce parser be able to recognize handles of left-sentential form when they appear on the stack.c)For a grammar to be LR(1) it is sufficient that a left-to-right shift reduce parser be able to recognize handles of left-sentential form or right-sentential form when they appear on the stack.d)All of the aboveCorrect answer is option 'A'. Can you explain this answer?
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