%{
#include "y.tab.h"
extern int yylval;
%}

%%

[ \t]+		; /* ignore whitespace */

"+"		{ return PLUS; }
"-"		{ return MINUS; }
"*"		{ return STAR; }
"/"		{ return DIV; }
"("		{ return LPAR; }
")"		{ return RPAR; }
"="		{ return EQUALS; }

[0-9]+		{ yylval=atoi(yytext); return NUMBER; }

[A-Z]		{ yylval=yytext[0]-'A'; return NAME; }

"$"		{ return 0; }

\n		|
.		{ return yytext[0]; }

%%

/* don't need main here with yacc */