#define INT 1
	#define FLOAT 2
%x SLCOMMENT MLCOMMENT
	const char *token_value;
%%

<SLCOMMENT>.*[\n]	{ BEGIN INITIAL; } 
<MLCOMMENT>(.|[\n])*"*/"	{ printf("There was a comment.\n"); BEGIN INITIAL; }

"//"	{ BEGIN SLCOMMENT; }
"/*"	{ BEGIN MLCOMMENT; }

[+-]?[xX][0-9a-fA-F]*	{ token_value = strdup(yytext); return INT; }
[+-]?[0][0-7]*		{ token_value = strdup(yytext); return INT; }
[+-]?[0-9]*		{ token_value = strdup(yytext); return INT; }

[+-]?[0-9]+\.[0-9]+	{ token_value = strdup(yytext); return FLOAT; }
[+-]?[0-9]+\.[0-9]+[eE][+-]?[0-9]+ { token_value = strdup(yytext); return FLOAT; }

%%

int main()
{
	yyin = stdin;
	int token;
	while((token = yylex()) > 0)
	{
		if(token == INT)
			printf("INT: %s\n", token_value);
		else if(token == FLOAT)
			printf("FLOAT: %s\n", token_value);
	}
}