www.pudn.com > progs.zip > ch3-05.l

%{
#include "y.tab.h"
#include "ch3hdr2.h"
#include 
%}

%%
([0-9]+|([0-9]*\.[0-9]+)([eE][-+]?[0-9]+)?) {
		yylval.dval = atof(yytext);
		return NUMBER;
	}

[ \t]	;		 /* ignore white space */

[A-Za-z][A-Za-z0-9]*	{	/* return symbol pointer */
		struct symtab *sp = symlook(yytext);

		yylval.symp = sp;
		return NAME;
	}

"$"	{ return 0; }

\n	|
.	return yytext[0];
%%