COMPUTER SCIENCE AND ENGINEERING
COMPILER DESIGN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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string character
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a syntax tree
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a set of RE
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a set of tokens
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Detailed explanation-1: -The lexical token is a string containing a unit of grammar used in the programming language expressed as a series of characters, and it is generated by the lexical analyzer. The Lexical Analyzer’s job and procedure is to tokenize the programme by dividing it into valid tokens and deleting all white space characters.
Detailed explanation-2: -What is the output of lexical analyzer? Explanation: A lexical analyzer coverts character sequences to set of tokens.
Detailed explanation-3: -Explanation: The lexical analyzer produces a list of tokens as output. 16.
Detailed explanation-4: -Token: A token is a group of characters having collective meaning: typically a word or punctuation mark, separated by a lexical analyzer and passed to a parser. A lexeme is an actual character sequence forming a specific instance of a token, such as num. The pattern matches each string in the set.
Detailed explanation-5: -LEX generates Lexical Analyzer as its output by taking the LEX program as its input. LEX program is a collection of patterns (Regular Expression) and their corresponding Actions. Patterns represent the tokens to be recognized by the lexical analyzer to be generated.