%option noyywrap
%{
	#include<stdio.h>
	void yyerror(char *);
%}
letter    [a-z A-Z]
digit    [0-9]
op       [-+*]
%%
else|int|float     {printf("%s is a keyword",yytext);}
 
{digit}+     {printf("%s is a number",yytext);}
{letter}({letter}|{digit})*    {printf("%s is an identifier",yytext);}
{op}+    {printf("%s is an operator",yytext);}
. yyerror("error");
%%
void yyerror(char *s)
{
fprintf(stderr,"%s\n",s);
}
int main()
{
        yylex();
	return 0;
}
 

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