Semantic Analyser Questions

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1.

 What is true about Syntax Directed Definitions?

A

Syntax Directed Definitions + Semantic rules = CFG

B

Syntax Directed Definitions + CFG = Semantic rules

C

CFG + Semantic rules = Syntax Directed Definitions

D

None of the above

Correct Answer: C

CFG + semantic rules = Syntax Directed Definitions

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2.

Which of the following error is expected to recognize by semantic analyzer?

A

Type mismatch

B

Undeclared variable

C

Reserved identifier misuse.

D

All of the above

Correct Answer: D

We have mentioned some of the semantics errors that the semantic analyzer is expected to recognize: Type mismatch, Undeclared variable, Reserved identifier misuse, Multiple declaration of variable in a scope, Accessing an out of scope variable, Actual and formal parameter mismatch.

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3.

____________ is a medium to provide semantics to the context-free grammar

A

Domain grammer

B

Attribute grammar

C

Object grammer

D

Value grammer

Correct Answer: B

Attribute grammar is a medium to provide semantics to the context-free grammar and it can help specify the syntax and semantics of a programming language.

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4.

Semantic analyzer attaches attribute information with AST, which are called?

A

Analyzer attribute

B

Attributed AST

C

Analyzer AST

D

AST

Correct Answer: B

Semantic analyzer attaches attribute information with AST, which are called Attributed AST.

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5.

Which attributes get values from the attribute values of their child nodes?

A

Synthesized attributes

B

Inherited attributes

C

S-attributed SDT

D

L-attributed SDT

Correct Answer: A

Synthesized attributes : These attributes get values from the attribute values of their child nodes.

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6.

 Which form of SDT uses both synthesized and inherited attributes with restriction of not taking values from right siblings?

A

T-attributed SDT

B

A-attributed SDT

C

S-attributed SDT

D

L-attributed SDT

Correct Answer: D

L-attributed SDT : This form of SDT uses both synthesized and inherited attributes with restriction of not taking values from right siblings.

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7.

If an SDT uses only synthesized attributes, it is called as?

A

T-attributed SDT

B

A-attributed SDT

C

S-attributed SDT

D

R-attributed SDT

Correct Answer: C

If an SDT uses only synthesized attributes, it is called as S-attributed SDT.

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8.

Which of the following tasks should be performed in semantic analysis?

A

Scope resolution

B

Type checking

C

Array-bound checking

D

All of the above

Correct Answer: D

The following tasks should be performed in semantic analysis: Scope resolution, Type checking, Array-bound checking.

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9.

What is meant by compositional semantics?

A

Determining the meaning

B

Logical connectives

C

Semantics

D

All of the above

Correct Answer: A

Compositional semantics is the process of determining the meaning of P*Q from P, Q and

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10.

What is true about Attribute Grammar?

A

Attribute grammar is a special form of context-free grammar

B

Each attribute has well-defined domain of values

C

The right part of the CFG contains the semantic rules

D

All of the above

Correct Answer: D

all of the above statement are true.

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