This document provides information on lexical analysis in compiler design. It begins with an introduction to compiler design and its phases, including lexical analysis. It then discusses how a lexical analyzer works by tokenizing code, removing whitespace and comments, and producing error messages. An example of tokens generated from sample code is provided. The document recommends hiring an assignment help service for compiler design tasks and provides contact information for one such service.

1. Valuable Information on Lexical
Analysis in Compiler Design

2. Table of Content
• What is Compiler Design
• Working Procedure
• Phases of Compiler
• What is Lexical Analysis
• How Lexical Analyzer Works
• Flow Chart of Lexical Analyzer
• Example of Tokens of Lexical Analysis
• Why You Need Compiler Design Assignment Help
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3. What is Compiler Design
• A compiler interprets the programmer's code into some different language
without changing the program context.
• A compiler should execute the target code efficiently and optimized based on
time and space.
• Compiler design systems give an in-depth prospect of the translation and
optimization method.
• Compiler design includes interpretation tools and error detection & recovery.

4. Working Procedure
• Cross Compiler works on a machine A
and generates a code for different
machine B.
• It creates code for a stage other than
where the compiler is running.
• Source-to-source Compiler interprets
source code into another programming
language source code.
• Source-to-source Compiler also known
as transcompiler or transpiler.

5. Phases of Compiler
Analysis Phase:
• Lexical Analyzer
• Syntax Analyzer
• Semantic Analyzer
• Intermediate Code Generator
Synthesis Phase:
• Code Optimizer
• Code Generator

6. What is Lexical Analysis
• Lexical Analysis is the first part of the analysis of the compiler.
• It is also known as a scanner. It transforms the High-level input program into a
Token series.
• Tokens: It is a sequence of characters. It can be demonstrated as a unit in the
programming language syntax. Example - Type token (id), Punctuation tokens
(void), and Alphabetic tokens (keywords).
• It can be implemented with the Deterministic Finite Automata.
• After execution, for syntax analysis, the output of a series of tokens is sent to the
parser.

7. How Lexical Analyzer Works
• Tokenization means Dividing the program into valid symbols.
• Remove white space characters.
• Remove comments.
• Provides help in producing error messages by implementing row and column
characters.

8. Flow Chart of Lexical Analyzer

9. Example of Tokens of Lexical Analysis
Code Tokens
• int, main, (, ), {, int, a, =, 45, b, =,
35, ;, printf, (, "Subtraction is :%d“,
,, a, -, b, ), ;, return, 0, ;, and }
• Total 27 tokens (valid)
• Comment line is not included
• int main()
• {
• int a = 45, b = 35;
• # Subtraction operation
• printf("Subtraction is :%d",a-b);
• return 0;
• }

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