'Num chars' diaporamas de présentation

Revision

Revision. Function in Spreadsheet. AVERAGE. Returns the average (arithmetic mean) of the arguments. Syntax AVERAGE(number1,number2, ...) Number1, number2, ... are 1 to 30 numeric arguments for which you want the average. AVERAGE. Remarks

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More on flex

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Programming language syntax

Programming language syntax. Three aspects of languages Syntax How are sentences formed? Semantics What does a sentence mean? Pragmatics How to use the language? Only syntax can be described formally Regular expressions and context-free grammars. Regular expressions (RE).

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Event-Driven Programming

Event-Driven Programming. Event-driven Pages. one popular feature of the Web is its interactive nature e.g., you click on buttons to make windows appear e.g., you enter credit card information in a form and submit it

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Introduction to Lex

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Introduction to Lex

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Flex

Flex. Fast LEX analyzer CMPS 450. Lexical analysis terms + A token is a group of characters having collective meaning. + A lexeme is an actual character sequence forming a specific instance of a token, such as num. + A pattern is a rule expressed as a regular expression

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LEFT

LEFT. LEFT returns the first character or characters in a text string, based on the number of characters you specify. Syntax LEFT ( text ,num_chars). LEN. LEN returns the number of characters in a text string. Syntax LEN ( text ). LOWER.

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Last Lecture Review

Last Lecture Review. ?. Lexical analyzer generator. State convention graph. Regular expression. Computer realization. Regular expression grammar. Equivalence. Equivalence. Subset construction. Nondeterministic finite automaton. Minimalist deterministic finite automaton.

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