Compilers

Lexical Analyser

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which one is a type of Lexeme?
Identifiers
Constants
Keywords
All of the mentioned
Explanation:
All of them along with Operators are different types of lexemes.
Question 2
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Pass Ratio : 100%
What is the output of a lexical analyzer?
Machine Code
Intermediate Code
Stream of Token
Parse Tree
Explanation:
The output given is in the form of tokens.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
In a compiler the module that checks every character of the source text is called __________
The code generator
The code optimizer
The lexical analyzer
The syntax analyzer
Explanation:
Lexical analysis is the process of converting a sequence of characters into a sequence of tokens.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the lexical analyser can handle Unicode?
Java CC
JFLex
Quex
All of the mentioned
Explanation:
JavaCC – JavaCC generates lexical analyzers written in Java.
Question 5
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Pass Ratio : 100%
The process of forming tokens from an input stream of characters is called __________
Liberalisation
Characterisation
Tokenization
None of the mentioned
Explanation:
The process of forming tokens from an input stream of characters is called tokenization.
Question 6
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Pass Ratio : 100%
An individual token is called ________
Lexeme
Lex
Lexeme & Lex
None of the mentioned
Explanation:
Individual Token is also Called Lexeme.
Question 7
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Pass Ratio : 100%
Lexical Analyser’s Output is given to Syntax Analysis.
True
False
Explanation:
Lexical Analyzer’s Output is given to Syntax Analysis.
Question 8
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Pass Ratio : 100%
A ________ is a string of characters which form a syntactic unit.
Lexeme
Lex
Lexeme & Lex
None of the mentioned
Explanation:
A lexeme is a string of characters that form a syntactic unit.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
What goes over the characters of the lexeme to produce value?
Scanner
Parser
Evaluator
Lexical generator
Explanation:
In order to construct a token, the lexical analyzer needs a second stage, the evaluator, which goes over the characters of the lexeme to produce a value.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
When expression sum=3+2 is tokenized then what is the token category of 3?
Identifier
Assignment operator
Integer Literal
Addition Operator
Explanation: