%{
%}

%%

[0-9]+[.][0-9]+ printf("%s is a floating point number\n",yytext);

int|float|char|double|void printf("%s is a datatype\n",yytext);

[0-9]+ printf("%s is an integer number\n",yytext);

[a-z]+[()] printf("%s is a function\n",yytext);

[a-z]+ printf("%s is an identifier\n",yytext);

[+=*/-] printf("%s is an operator\n",yytext);

; printf("%s is an delimiter\n",yytext);

, printf("%s is a separator\n",yytext);

[#][a-z\.h]+ printf("%s is a preprocessor\n",yytext);
%%

int yywrap(void)
{
	return 1;
}

int main()
{
  // reads input from a file named test.c rather than terminal
  freopen("test.c", "r", stdin);
	yylex();
	return 0;
}