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An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if the
- a)SLR(1) parser for G has S-R conflicts
- b)LR(1) parser for G has S-R conflicts
- c)LR(0) parser for G has S-R conflicts
- d)LALR(1) parser for G has reduce-reduce conflicts
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflict...
Understanding Shift-Reduce Conflicts in LALR(1) Parsers
Shift-reduce (S-R) conflicts are a common challenge in parser design, particularly in LALR(1) parsers. To understand the relationship between LALR(1) and other types of parsers, let's break down the implications of S-R conflicts.
1. Relationship with SLR(1) Parsers
- An SLR(1) parser is less powerful than an LALR(1) parser, which means that if an SLR(1) parser encounters S-R conflicts, the LALR(1) parser might also face similar issues.
- However, the reverse isn't necessarily true; an LALR(1) parser can resolve conflicts that an SLR(1) parser cannot due to additional lookahead capabilities.
2. Connection with LR(1) Parsers
- An LR(1) parser is the most powerful among the three types and can handle more complex grammars without conflicts.
- If an LR(1) parser has S-R conflicts, it indicates that the grammar is inherently problematic, which also implies that an LALR(1) parser will encounter S-R conflicts in the same scenarios. Therefore, the presence of conflicts in LR(1) directly correlates with conflicts in LALR(1).
3. Significance of LR(0) Parsers
- LR(0) parsers are even less capable than SLR(1) parsers. While they can identify conflicts, the presence of conflicts in LR(0) does not directly lead to S-R conflicts in LALR(1) parsers.
4. Conclusion on Reduce-Reduce Conflicts
- Reduce-reduce conflicts in LALR(1) parsers do not have a direct correlation to the presence of S-R conflicts in other parser types.
In summary, the correct answer is option 'B' because if an LR(1) parser has S-R conflicts, it guarantees that an LALR(1) parser will also experience similar conflicts, establishing a direct relationship between the two types of parsers.
Shift-reduce (S-R) conflicts are a common challenge in parser design, particularly in LALR(1) parsers. To understand the relationship between LALR(1) and other types of parsers, let's break down the implications of S-R conflicts.
1. Relationship with SLR(1) Parsers
- An SLR(1) parser is less powerful than an LALR(1) parser, which means that if an SLR(1) parser encounters S-R conflicts, the LALR(1) parser might also face similar issues.
- However, the reverse isn't necessarily true; an LALR(1) parser can resolve conflicts that an SLR(1) parser cannot due to additional lookahead capabilities.
2. Connection with LR(1) Parsers
- An LR(1) parser is the most powerful among the three types and can handle more complex grammars without conflicts.
- If an LR(1) parser has S-R conflicts, it indicates that the grammar is inherently problematic, which also implies that an LALR(1) parser will encounter S-R conflicts in the same scenarios. Therefore, the presence of conflicts in LR(1) directly correlates with conflicts in LALR(1).
3. Significance of LR(0) Parsers
- LR(0) parsers are even less capable than SLR(1) parsers. While they can identify conflicts, the presence of conflicts in LR(0) does not directly lead to S-R conflicts in LALR(1) parsers.
4. Conclusion on Reduce-Reduce Conflicts
- Reduce-reduce conflicts in LALR(1) parsers do not have a direct correlation to the presence of S-R conflicts in other parser types.
In summary, the correct answer is option 'B' because if an LR(1) parser has S-R conflicts, it guarantees that an LALR(1) parser will also experience similar conflicts, establishing a direct relationship between the two types of parsers.
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An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflict...
LALR parser is reduced form of CLR or LR(1) parser. LALR parser uses the LR(1) items of CLR parser and if any shift reduce conflicts are there, then it is due to LR(1) parser.
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An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer?.
An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2025 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer?.
Solutions for An LALR(1) parser for a grammar G can have shift-reduce (S-R) conflicts if and only if thea)SLR(1) parser for G has S-R conflictsb)LR(1) parser for G has S-R conflictsc)LR(0) parser for G has S-R conflictsd)LALR(1) parser for G has reduce-reduce conflictsCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
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