Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > A canonical set of items is given belowS --&#...
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A canonical set of items is given below
S --> L. > R
Q --> R.
Q --> R.
On input symbol < the set has
- a)a shift-reduce conflict and a reduce-reduce conflict.
- b)a shift-reduce conflict but not a reduce-reduce conflict.
- c)a reduce-reduce conflict but not a shift-reduce conflict.
- d)neither a shift-reduce nor a reduce-reduce conflict
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
A canonical set of items is given belowS --> L. > RQ --> R...
The question is asked with respect to the symbol ' < ' which is not present in the given canonical set of items. Hence it is neither a shift-reduce conflict nor a reduce-reduce conflict on symbol '<'. Hence D is the correct option. But if the question would have asked with respect to the symbol ' > ' then it would have been a shift-reduce conflict.
Most Upvoted Answer
A canonical set of items is given belowS --> L. > RQ --> R...
Explanation:
Shift-Reduce Conflict:
A shift-reduce conflict occurs in a parsing table when there is both a shift and a reduce action possible on the same input symbol. This conflict arises when the parser is unable to determine whether to shift the input symbol onto the stack or to reduce the existing symbols on the stack.
Reduce-Reduce Conflict:
A reduce-reduce conflict occurs in a parsing table when there are two or more reduce actions possible on the same input symbol. This conflict arises when the parser is unable to determine which grammar production to use for reducing the symbols on the stack.
Given Canonical Set of Items:
S -- L.
RQ -- R.
Analysis:
The given canonical set of items does not have any shift-reduce conflict or reduce-reduce conflict. Let's analyze each item in the set:
1. S -- L.
This item indicates that the parser has seen the symbol 'L' and is expecting to see the end of the input. The dot (.) indicates the current position in the production.
2. RQ -- R
This item indicates that the parser has seen the symbols 'R' and 'Q' and is expecting to see the end of the input. The dot (.) indicates the current position in the production.
Conclusion:
Since there is no conflict in the given canonical set of items, the correct answer is option 'D' - neither a shift-reduce nor a reduce-reduce conflict.
Shift-Reduce Conflict:
A shift-reduce conflict occurs in a parsing table when there is both a shift and a reduce action possible on the same input symbol. This conflict arises when the parser is unable to determine whether to shift the input symbol onto the stack or to reduce the existing symbols on the stack.
Reduce-Reduce Conflict:
A reduce-reduce conflict occurs in a parsing table when there are two or more reduce actions possible on the same input symbol. This conflict arises when the parser is unable to determine which grammar production to use for reducing the symbols on the stack.
Given Canonical Set of Items:
S -- L.
RQ -- R.
Analysis:
The given canonical set of items does not have any shift-reduce conflict or reduce-reduce conflict. Let's analyze each item in the set:
1. S -- L.
This item indicates that the parser has seen the symbol 'L' and is expecting to see the end of the input. The dot (.) indicates the current position in the production.
2. RQ -- R
This item indicates that the parser has seen the symbols 'R' and 'Q' and is expecting to see the end of the input. The dot (.) indicates the current position in the production.
Conclusion:
Since there is no conflict in the given canonical set of items, the correct answer is option 'D' - neither a shift-reduce nor a reduce-reduce conflict.
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A canonical set of items is given belowS --> L. > RQ --> R.On input symbol < the set hasa)a shift-reduce conflict and a reduce-reduce conflict.b)a shift-reduce conflict but not a reduce-reduce conflict.c)a reduce-reduce conflict but not a shift-reduce conflict.d)neither a shift-reduce nor a reduce-reduce conflictCorrect answer is option 'D'. Can you explain this answer?
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