%option noyywrap
%{
	#include<stdio.h>
%}
digit [0-9]
letter [A-Za-z]
key "int"|"main"|"for"|"return"|"printf"|"while"|"scanf"|"if"

%%
 {key} {printf("%s is a keyword and length is: %d\n", yytext, yyleng);}
 {letter}({letter}|{digit})* {printf("%s is an identifier and length is: %d\n", yytext, yyleng);}
 {digit}+ {printf("%s is an int value: %d\n", yytext, atoi(yytext));}
 {digit}+"."{digit}+ {printf("%s is a floating-point number and value is: %f\n", yytext, atof(yytext));}
%%

int main()
{
	yylex();                
	return 0;
}