Q. Which grammar rules violate the requirements of an operator grammar ?
1.P → Q R

2.P → Q s R

3.P → ε

4.P → Q t R r

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Q. S → C C
C → c C | d

The grammar is

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Q. Given the following expression grammar:
E -> E * F | F + E | F

F -> F - F | id

Which of the following is true?

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Q. lanation: e.g. input is 3*4-5 rFirst ‘- ‘ is be evaluated then ‘ *’.5. Which one of the following is true at any valid state in shift-reduce parsing?

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Q. Match the following:
List-I List-II

A. Lexical analysis 1. Graph colouring

B. Parsing 2. DFA minimization

C. Register allocation 3. Post-order traversal

D. Expression evaluation 4. Production tree

A B C D

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Q. Consider the following grammar G.
S → F ⎪ H

F → p ⎪ c

H → d ⎪ c

Which one is true?

S1: All strings generated by G can be parsed with help of LL (1).

S2: All strings generated by G can be parsed with help of LR (1).

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Q. Consider the following two sets of LR (1) items of an LR (1) grammar.
X -> c.X, c/d

X -> .cX, c/d

X -> .d, c/d

X -> c.X, $

X -> .cX, $

X -> .d, $

Which one is false?

1. Cannot be merged since look ahead’s are different.

2. Can be merged but will result in S-R conflict.

3. Can be merged but will result in R-R conflict.

4. Cannot be merged since goto on c will lead to two different sets.

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Q. Lr parser are attractive because

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Q. Which is the most powerful parser?

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Q. How is the parsing precedence relations defined

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Q. When will the relationship between ‘+’ and ‘-’ be <

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Q. When will the relationship between ‘<’ and ‘>’ be <

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Q. In an absolute loading scheme which loader function is accomplished by assembler

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Q. Shift reduce parser are

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Q. Which of these is true about LR parsing ?

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Q. Which of the following is incorrect for the actions of A LR-Parser I) shift s ii) reduce A->ß iii) Accept iv) reject?

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