Changing the way you learn

Question 1

Question

Which of the following is NOT a top-down parsing?

Answer

Recursive descent parsing
Backtracking
LL(1) parsing
None of these

Question 2

Question

Which of the following is true for parser generator

Answer

The input of a parser generator is a token stream
The output of a parser generator is abstract syntax tree(AST)
CFG of a programming language is part of the input to a parser generator.
Flex is a parser generator

Question 3

Question

Which of the follwoing is NOT true for parser? i. The parser is to process a token stream ii. One of the major responsibilities of parser is to detect syntax errors. iii. The output of parser is an abstract syntax tree.

Answer

i
i, ii
i, ii, iii
ii, iii
iii
None of the above.

Question 4

Question

Grammar that produce more than one parse tree for same sentence:

Answer

is ambiguous
is unambiguous
has syntax errors
is not LL(1) grammar

Question 5

Question

Which of the following is WRONG

Answer

A CFG grammar is said to be ambiguous if for a sentence, there is a leftmost derivation and a rightmost derivation
A DFG grammar is said to be ambiguous if for a sentence, there are two leftmost derivations.
A CFG grammar is said to be ambiguous if for a sentence, there are two rightmost derivations.
A CFG grammar is said to be ambiguous if for a sentence, there are two different parse tree representations.

Question 6

Question

The context free grammar S -> SS | 0S1 | 1S0| ε generates.

Answer

Equal number of 0's and 1's
Unequal number of 0's and 1's
Number of 0's followed by any number of 1's
None of the above.

Question 7

Question

Which of the following is a Tiger program with syntax errors?

Answer

1
"1"
x = 5
var x: int := 5
All of the above

Question 8

Question

Which of the following is a Tiger program without syntax errors?

Answer

(1, 2, 3)
(1; 2; 3;)
(1; 2; 3)
(1, 2, 3,)
None of the above

Question 9

Question

Which of the following is a Tiger expression with syntax errors?

Answer

a(1)
b[1]
c[2] of 3
(10)
NONE of the above

Question 10

Question

Which of the following derivations does a LL(1) parser use while parsing an input string? The input is assumed to be scanned in left to right order?

Answer

Leftmost derivation
Rightmost derivation
None of the above

Question 11

Question

Assume X (terminal or non-terminal) is the top symbol in the stack, and c is the next symbol in the input in LL(1) parsing, which of the following indicates a syntax error? i. x is any terminal other than c ii. x is a non-terminal, but the cell M[X,c] in the parsing table is empty iii. x is any non-terminal other than c iv. x is a non-terminal, but the cell M[X,c] in the parsing table is not empty

Answer

i
i and iii
i, ii, iii, and iv
None of the above

Question 12

Question

Assume FIRST(A) = {b, c, d, ε} for a non-terminal A, what's the result of FIRST(eAf) where e and f are terminals?

Answer

{b, c, d, e}
{b, c, d}
{e, f}
{e}

Question 13

Question

Assume FIRST(A) ={b, c, d, ε} for a non-terminal A, what's the result of FIRST(Ae) where e is a terminal?

Answer

{b, c , d, e}
{b, c, d}
{e}
{b, c, d, e, ε}

Question 14

Question

Assume FIRST(A) ={1, 2, ε}, and FIRST(B) = {b, d} for non- terminal A and B, what's the result of FIRST(AB)?

Answer

{b, d, ε}
{1, 2}
{b, d, 1, 2}
{1, 2, ε}
{b, d, 1, 2, ε}

Question 15

Question

Assume FIRST(A) ={1, 2, ε}, and FIRST(B) = {b, d} for non- terminal A and B, what's the result of FIRST(BA)?

Answer

{b, d}
{1, 2}
{b, d, 1, 2}
{1, 2, ε}
{b, d, 1, 2, ε}

Question 16

Question

Assume FIRST(A) ={1, 2, ε}, and FIRST(B) = {b, d, ε} for non- terminal A and B, what's the result of FIRST(BA)?

Answer

{b, d, ε}
{1, 2}
{b, d, 1, 2}
{1, 2, ε}
{b, d, 1, 2, ε}

Question 17

Question

Assume FOLLOW(A) ={b, d}, FIRST(B) = {1, 2}, for non-terminal A and B, which of the following statements is correct for a production: A-> ABgh where g and h are terminals?

Answer

FOLLOW(B) contains g
FOLLOW(B) contains h
FOLLOW(B) contains both g and h
g and h are not in FOLLOW(B)
FOLLOW(B) contains b, and d

Question 18

Question

Assume FOLLOW(A) ={b, d}, FIRST(B) = {1, 2, ε}, for non-terminal A and B, which of the following statements is correct for a production: A-> ACB where C is a non-terminal?

Answer

FOLLOW(C) contains {1, 2, ε}
FOLLOW(C) contains {b, d}
FOLLOW(C) contains {1, 2, b, d, ε}
FOLLOW(C) contains {1, 2, b, d}

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	Created by Thomas Scott almost 6 years ago