GATE CS 2026 Set 2 — Question 41
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Compiler Design → Syntax Analysis → LR(0) & SLR(1)
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Question
Consider the canonical parsing of the grammar below using terminals and non-terminals with as the start symbol.
Which one of the following options gives the number of shift-reduce conflicts that will occur in the ACTION table?
S → ACBWhich one of the following options gives the number of shift-reduce conflicts that will occur in the ACTION table?
Correct answer
(D) 5
Solution
We construct the item sets. The augmented grammar is .State :
(Reduce )
(Reduce )
(Reduce )
(Reduce )
(Reduce )
(Reduce )
- Shift on 'a' to .
- Reduce applies to all terminals in .
- Conflict 1: Shift/Reduce on input 'a'.
(Reduce )
- Shift on 'a' to (loop).
- Reduce .
- Conflict 2: Shift/Reduce on input 'a'.
(Reduce )
- Shift on 'c' to .
- Reduce .
- Conflict 3: Shift/Reduce on input 'c'.
(Reduce )
- Shift on 'c' to (loop).
- Reduce .
- Conflict 4: Shift/Reduce on input 'c'.
- Shift on 'b' to . No reduce items here.
(Reduce )
- Shift on 'b' to (loop).
- Reduce .
- Conflict 5: Shift/Reduce on input 'b'.
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