%{
#include <stdio.h>
%}
 
/* Definitions */
DIGIT       [0-9]
LETTER      [a-zA-Z]
ID          ({LETTER}|_){LETTER}*({LETTER}|{DIGIT}|_)*
INTEGER     {DIGIT}+
FLOAT       {DIGIT}+"."{DIGIT}+
OPERATOR    "+"|"-"|"*"|"/"
WHITESPACE  [ \t\n]+
 
%%
 
/* Rules */
{INTEGER}   { printf("INTEGER: %s\n", yytext); }
{FLOAT}     { printf("FLOAT: %s\n", yytext); }
{ID}        { printf("IDENTIFIER: %s\n", yytext); }
{OPERATOR}  { printf("OPERATOR: %s\n", yytext); }
{WHITESPACE}  /* skip whitespace */
.           { printf("UNRECOGNIZED: %s\n", yytext); }
 
%%
 
int main(int argc, char *argv[]) {
    // Initialize the lexer
    yyin = fopen(argv[1], "r");
    // Call the lexer
    yylex();
    // Close the input file
    fclose(yyin);
    return 0;
}
 

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