-
Start the program.
-
Lex program consists of three parts.
a. Declaration %%
b. Translation rules %%
c. Auxilary procedure.
-
The declaration section includes declaration of variables, maintest, constants and regular definitions.
-
Translation rule of lex program are statements of the form
a. P1 {action}
b. P2 {action}
c. …
d. …
e. Pn {action}
-
Write a program in the vi editor and save it with .l extension.
-
Compile the lex program with lex compiler to produce output file as lex.yy.c. eg $ lex filename.l $ cc lex.yy.c
-
Compile that file with C compiler and verify the output.
ex-4---generation-of-lexical-tokens-lex-flex-tool's Introduction
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