UNIT - 2 A Understanding Parsers in Compilers

What is the main role of a parser in a compiler?

• Lexical analysis

• Syntax analysis

• Code optimization

• Semantic analysis

Which of the following errors is detected by the parser?

• Syntax errors

• Lexical errors

• Runtime errors

• Logical errors

The output of a parser is typically a:

• Token stream

• Parse tree

• Symbol table

• Intermediate code

Why is parsing necessary in a compiler?

• To convert high-level code into machine code

• To ensure the program adheres to the syntax of the language

• To detect semantic errors

• To optimize the source code

Which phase follows the parser in a typical compiler?

• Lexical analysis

• Code generation

• Semantic analysis

• Intermediate code generation

What is a grammar in the context of programming languages?

• A set of syntax rules defining the structure of valid programs

• A tool for optimizing machine code

• A list of keywords and tokens

• A method for detecting runtime errors

Which type of grammar is commonly used in compilers?

• Regular grammar

• Context-free grammar

• Context-sensitive grammar

• Unrestricted grammar

What is a production rule in a grammar?

• A rule for converting tokens into machine code

• A transformation rule for non-terminal symbols

• A rule for optimizing the parse tree

• A rule for error handling in a parser

Which component in a grammar specifies the start of parsing?

• Terminal symbols

• Start symbol

• Non-terminal symbols

• Parse tree root

What do terminal symbols represent in a grammar?

• Keywords and operators in the language

• Intermediate tokens

• Non-terminal nodes in a parse tree

• Rules for generating code