Write a lex program that copies a file

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Usually, the lex utility shall write the program it generates to the file lex. The following options shall be supported: -n Suppress the summary of statistics usually written with the -v option. If no table sizes are specified in the lex source code and the -v option is not specified, then -n is implied. See the discussion of lex table sizes in Definitions in lex.
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Generating a Lexical Analyzer Program

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SFU Compilers class: Homework | Lexer

The rules section is mandatory. Sections for definitions and user routines are optional, but must appear in the indicated order if present:. If there is no second delimiter, the rules section is presumed to continue to the end of the program. Lines in the rules section that begin with white space and that appear before the first rule are copied to the beginning of the function yylex , immediately after the first brace. You might use this feature to declare local variables for yylex. Each rule specifies the pattern sought and the actions to take on finding it.
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Lex and YACC primer/HOWTO

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I have a Lex program that reads if a given character is an alphabet or number. How to I take my inputs directly from a file. This is my simple program.
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The lex command does not recognize your rules without this delimiter. Each pattern can have a corresponding action, that is, a C command to execute when the pattern is matched. Each statement must end with a ; semicolon. This is why our first example, the shortest lex program, functioned properly.
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