2.basics of web programming using asp.net
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The document discusses the basics of web programming using ASP.NET. It defines key concepts such as character set, tokens, keywords, identifiers, literals, punctuators, operators, data types and variables. Character set refers to the set of valid characters a language can recognize like letters, digits and symbols. The smallest individual unit in a program is called a token which can be keywords, identifiers, literals, operators or punctuators. Keywords are reserved words, identifiers name parts of a program, literals are constants, operators perform computations and punctuators separate tokens. Data types declare the type of variables which are used to store information.
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Token, Pattern and Lexeme defines some key concepts in lexical analysis:
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Token: Token is a sequence of characters that can be treated as a single logical entity. Typical tokens are,
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Relationship Among Token, Lexeme & Pattern
Relationship among Token, Lexeme and Pattern
Outline
Token
Lexeme
Pattern
Relationship
Tokens : A token is sequence of characters that can be treated
as a unit/single logical entity.
Examples
Keywords
Examples : for, while, if etc.
Identifier
Examples : Variable name, function name, etc.
Operators
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Pattern
Pattern is a rule describing all those lexemes that can represent a particular token in a source language.
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Example : “float”, “=“, “223”, “;”
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Outline
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