Compilers

Lexical Analyser

Question 1
Marks : +2 | -2
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 2
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 3
Marks : +2 | -2
Pass Ratio : 100%
Which grammar defines Lexical Syntax?
Regular Grammar
Syntactic Grammar
Context free Grammar
Lexical Grammar
Explanation:
The specification of a programming language often includes a set of rules, the lexical grammar, which defines the lexical syntax.
Question 4
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 5
Marks : +2 | -2
Pass Ratio : 100%
The context free grammar is ambiguous if ______________
The grammar contains non-terminals
Produces more than one parse tree
Production has two non-terminals side by side
None of the mentioned
Explanation:
Since more than one parse tree is generated hence one than option is available .Therefore it’s ambiguous.
Question 6
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:
Question 7
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 8
Marks : +2 | -2
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 9
Marks : +2 | -2
Pass Ratio : 100%
Which phase of the compiler is Lexical Analyser?
First
Second
Third
None of the mentioned
Explanation:
Lexical Analyzer is First Phase of Compiler.
Question 10
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.