%{
#include <stdio.h>
#include <stdlib.h>
#include "y.tab.h"
%}
 
/* Definitions */
DIGIT      [0-9]
LETTER     [a-zA-Z]
IDENTIFIER {LETTER}({LETTER}|{DIGIT})*
NUMBER     {DIGIT}+
STRING     \"([^\"]*)\"
KEYWORDS   "if"|"else"|"while"|"return"|"int"|"float"|"char"|"double"
 
%%
 
{STRING}    { printf("String: %s\n", yytext); }
{KEYWORDS}   { printf("Keyword: %s\n", yytext); }
{NUMBER}     { printf("Constant: %s\n", yytext); }
{IDENTIFIER} { printf("Identifier: %s\n", yytext); }
"\'". "\'" { printf("Literal: %s\n", yytext); }
 
[ \t\n]+    ;  /* Ignore whitespace */
.           { printf("Unknown character: %s\n", yytext); }
 
%%
 
int main() {
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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