threeadd.l

#include <stdio.h>
#include <string.h>
#include "threeAdd.tab.h"

void yyerror(char*);
extern YYSTYPE yylval;
%}
NAME	[a-zA-Z]
DIGITS  [0-9]
DOUBLE	{DIGITS}(\.{DIGITS})?

%%
[ \t]+ 	 { }
{DIGITS}+ {//sscanf(yytext,"%s", &yylval.ivar);
		strcpy(yylval.ivar,yytext);
		 }
"+"  {
		    return *yytext;
	     }
"-"  {
		    return *yytext;
	     }
"*"  {
		    return *yytext;
	     }
"/"  {
		    return *yytext;
	     }
"="  {
		    return *yytext;
	     }
"(" 	 {
			return *yytext;
		 }
")" 	 {
			return *yytext;
		 }
{NAME} 	 {
			//sscanf(yytext,"%s", &yylval.ivar);
			strcpy(yylval.ivar,yytext);
		}
"\n" 	     {
			return *yytext;
		 }
exit     {
			return 0;
		 }

.        {
			char msg[25];
			sprintf(msg," <%s>","invalid character",yytext);
			yyerror(msg);
		 }


%%