MCQs on FLEX, BISON, Lexical Analysis

What are the main phases of a compiler?

• syntax checking, execution, memory management

• code optimization, error handling, debugging

• The main phases of a compiler are lexical analysis, syntax analysis, semantic analysis, optimization, and code generation.

• token generation, parsing, execution

What is the role of a lexical analyzer?

• To manage memory allocation for variables.

• To optimize the performance of a program during execution.

• The role of a lexical analyzer is to convert input text into tokens for further processing.

• To compile source code into machine language.

Explain the difference between tokens and lexemes.

• Tokens are the specific character sequences, while lexemes are the abstract categories.

• Tokens and lexemes are interchangeable terms with no distinct meaning.

• Tokens refer to the physical representation of data, while lexemes are the rules for parsing.

• Tokens are the abstract categories of meaning, while lexemes are the specific character sequences that represent those categories.

What is LEX and how is it used in compiler design?

• LEX is a graphical user interface for compilers.

• LEX is a tool for generating lexical analyzers in compiler design.

• LEX is a programming language used for data analysis.

• LEX is a database management system.

Describe the process of tokenization using LEX.

• Tokenization in LEX involves compiling source code into machine language.

• Tokenization is the process of converting tokens into a binary format.

• Tokenization in LEX is solely about parsing JSON files.

• Tokenization in LEX is the process of defining patterns for tokens in a specification file, generating a lexical analyzer, and producing a stream of tokens from input text.

What are regular expressions and how do they relate to LEX?

• Regular expressions are patterns used for matching strings, and LEX uses them to define token patterns for lexical analysis.

• Regular expressions are only used in web development.

• Regular expressions are exclusively for data encryption.

• LEX is a programming language for creating GUIs.

What is the main purpose of FLEX?

• Parsing structured data

• Generating lexical analyzers

• Performing syntax analysis

• Interpreting machine code

In a FLEX program, what does yytext represent?

• The token type

• The matched input string

• The input file name

• The error message

Which of the following symbols is used to define token patterns in FLEX?

• ::

• %%

• $$

• #

Which section of a FLEX program contains the token definitions?

• Header Section

• Rules Section

• User Code Section

• Function Definition Section