COMPUTER SCIENCE AND ENGINEERING
COMPILER DESIGN
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Detailed explanation-1: -A lex program consists of three sections: a section containing definitions, a section containing translations, and a section containing functions.
Detailed explanation-2: -A lex program consists of three parts: the definition section, the rules section, and the user subroutines.
Detailed explanation-3: -The mandatory rules section opens with the delimiter %%. If a routines section follows, another %% delimiter ends the rules section. The %% delimiters must be entered at the beginning of a line, that is, without leading blanks.
Detailed explanation-4: -lex Specification File The input file can contain three sections: definitions, rules, and user subroutines. Each section must be separated from the others by a line containing only the delimiter, %% (double percent signs).
Detailed explanation-5: -The Structure of LEX: It is also possible to write any C code here, which will be copied verbatim into the generated source file. It is bracketed with % and %. The Rules section is the most important section; Each rule is made up of two parts: a pattern and an action separated by whitespace.