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
Marks : +2 | -2
Pass Ratio : 100%
Two Important lexical categories are __________
White Space
Comments
None of the mentioned
White Space & Comments
Explanation:
Two important common lexical categories are white space and comments.
Question 3
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 4
Marks : +2 | -2
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 5
Marks : +2 | -2
Pass Ratio : 100%
What is another name for Lexical Analyser?
Linear Phase
Linear Analysis
Scanning
All of the mentioned
Explanation:
Lexical Analyzer is also called “Linear Phase” or “Linear Analysis” or “Scanning“.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Input to Lexical Analyser is _________
Source Code
Object Code
Lexeme
None of the mentioned
Explanation:
Lexical analyser’s Input is Source Code.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Lexers are often generated by a lexer generator, same as parser generators.
True
False
Explanation:
Lexers are often generated by a lexer generator same as parser.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Lexical Analysis Identifies Different Lexical Units in a _______
Source Code
Object Code
Lexeme
None of the mentioned
Explanation:
Lexical Analysis Identifies Different Lexical Units in a source Code.
Question 9
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 10
Marks : +2 | -2
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.