1. Functions and Error Recovery

• What are the main functions of a lexical analyzer? List the various error recovery strategies in lexical analysis.[2012]

2. Importance of Lexical Analyzer

• Why is a lexical analyzer essential? Explain.[2015]

3. Tokens

• What do you mean by a token? Describe different types of tokens.[2021, 17, 12, 10]

4. Token, Pattern, and Lexeme

• Define token, pattern, and lexeme with examples.[2019, 14, 09]Or,What do you mean by token, lexeme, and identifier?[2011]

5. Buffering in Lexical Analysis

• Why is buffering used in lexical analysis? What are the commonly used buffering methods?[2021, 17]

6. Input Buffering Techniques

• Describe the input buffering techniques in detail.[2020, 17]
• Write down the input buffering technique with code.[2015]Or,How does an input buffer work? Write its code.[2011]

Page 144: Compiler Design and Construction

7. Regular Expressions and Definitions

• Define a regular expression with an example. What are the rules for constructing regular expressions?[2012]
• Define a regular definition. Give the regular definition for unsigned numbers in Pascal.[2020, 11]Or,Give the regular definition for unsigned numbers in Pascal and identifiers.[2010]

8. Lexical Syntax

• Why do we use regular expressions to define the lexical syntax of a language?[2011]