/* 
 * Lex/flex scanner for simple expression evaluator.
 */

%{
#define YYSTYPE float
YYSTYPE yylval;

#include "calc2.tab.h"
%}

digit       [0-9]
number      {digit}+
newline     \n
whitespace  [ \t]+

%option noyywrap

%%

"+"             {return PLUS;}
"-"             {return MINUS;}
"*"             {return TIMES;}
"/"             {return DIVIDES;}
"("             {return LPAREN;}
")"             {return RPAREN;}
{number}        {yylval = atof(yytext); return NUMBER;}
{newline}       {return NEWLINE;}
{whitespace}    {/* skip whitespace */}
.               {return ERROR;}

%%