Valuable Information on Lexical Analysis in Compiler Design

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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 Why Choose Us Our Relevant Services Contact Us

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 W orks 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 ; }

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