Q. Lr parser are attractive because

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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. 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. 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. 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. 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. S → C C
C → c C | d

The grammar is

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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. Consider the grammar defined by the following production rules
S --> T * P

T --> U | T * U

P --> Q + P | Q

Q --> Id

U --> Id

Which one of the following is TRUE?

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Q. Consider the following two statements:
P: Every regular grammar is LL(1)

Q:Regular is LR(1) grammar

Which of the following is TRUE?

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Q. Find the TRUE statement?
I. There exist parsing algorithms for some programming languages which has O (3) complexities

II. A programming language which allows recursion can be implemented with static storage allocation.

III.No L-attributed definition can be evaluated in The framework of bottom-up parsing.

IV. Code improving transformations can be performed at both intermediate code level and source Language.

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Q. Consider the grammar with the following translation rules and E as the start symbol.
A -> A1 #B {A.value = A1.value * B.value}

| B {A.value = B.value}

B-> B1 & F {B.value = B1.value + C.value}

| C {B.value= C.value }

C -> num {C.value = num.value}

Compute E.value for the root of the parse tree for the expression:2 # 3 & 5 # 6 &4.

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Q. A Push Down Automata is if there is at most one transition applicable to each configuration

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Q. In Right-Linear grammars, all productions have the form: A → xB.

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