Analysis Phase >> Lexical Analysis [ Phases of Compiler ]

Compiler : For Definition [ Click Here ]
Different phases of compilers :

1. Analysis Phase
2. Synthesis Phase

1.Analysis Phase :

• Lexical analysis
• Syntax analysis
• Semantic analysis

Lexical Analysis Phase :

1. Lexical Analyzer is First Phase Of Compiler. 
2. Input to Lexical Analyzer is "Source Code"
3. Lexical Analysis Identifies Different Lexical Units in a Source Code.
4. Different Lexical Classes or Tokens or Lexemes
• Identifiers
• Constants
• Keywords
• Operators
5. Example : sum = num1 + num2 ;

So Lexical Analyzer Will Produce Symbol Table -

Token	Type
sum	Identifier
=	Operator
num1	Identifier
+	Operator
num2	Identifier
;	Seperator

6. Lexical Analyzer is also called "Linear Phase" or "Linear Analysis" or "Scanning"
7. Individual Token is also Called Lexeme
8. Lexical Analyzer's Output is given to Syntax Analysis.

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Tags / Keywords : | Code Generation, Compiler, Languages, Lexical analysis, Parsing, Program optimization, Programming, source code

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