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ex-4---generation-of-lexical-tokens-lex-flex-tool's Introduction

Ex-4-GENERATION OF LEXICAL TOKENS LEX FLEX TOOL

AIM

To write a lex program to implement lexical analyzer to recognize a few patterns.

ALGORITHM

  1. Start the program.

  2. Lex program consists of three parts.

    a. Declaration %%

    b. Translation rules %%

    c. Auxilary procedure.

  3. The declaration section includes declaration of variables, maintest, constants and regular definitions.

  4. Translation rule of lex program are statements of the form

    a. P1 {action}

    b. P2 {action}

    c. …

    d. …

    e. Pn {action}

  5. Write a program in the vi editor and save it with .l extension.

  6. Compile the lex program with lex compiler to produce output file as lex.yy.c. eg $ lex filename.l $ cc lex.yy.c

  7. Compile that file with C compiler and verify the output.

INPUT

OUTPUT

RESULT

The lexical analyzer is implemented using lex and the output is verified.

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