%option noyywrap
%{
#include "y.tab.h"
%}
%%
"+"				return ADD;
"-"				return SUB;
"*"				return MUL;
"/"				return DIV;
"("				return LP;
")"				return RP;
"\n"			return LF;
[1-9][0-9]*		{
	sscanf(yytext, "%d", &yylval);
	return NUM;
}
[ \t\r]			;
.				printf("lex error : %s\n", yytext);