%{
#include <stdio.h>
%}
 
KEYWORD     int|float|if|else|while|return
IDENTIFIER  [a-zA-Z_][a-zA-Z0-9_]*
NUMBER      [0-9]+
OPERATOR    \+|\-|\*|\/|=|<|>
SYMBOL      ;|,|\(|\)|\{|\}
 
%%
 
{KEYWORD}      { printf("KEYWORD     : %s\n", yytext); }
{IDENTIFIER}   { printf("IDENTIFIER  : %s\n", yytext); }
{NUMBER}       { printf("NUMBER      : %s\n", yytext); }
{OPERATOR}     { printf("OPERATOR    : %s\n", yytext); }
{SYMBOL}       { printf("SYMBOL      : %s\n", yytext); }
 
[ \t\n]+       ;
.              { printf("UNKNOWN     : %s\n", yytext); }
 
%%
 
int yywrap() {
    return 1;
}
 
int main() {
    yylex();
    return 0;
}
 

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