Done. The working result can be found on "How to Create a Math Calculator in C, the right Way (http://originalcopy-on.blogspot.com/2008/10/how-to-make-math-calculator-right-way.html)"

I'm almost done with it, the previous errors are fixed now. The only issue I still have is how to get the last token from the last reduction
("in" in parser.y, but in the current code it looks...

You could try to do it my way, like in a programming language: simple calculator using a scanner (re2c) and a parser generator (lemon) (http://www.daniweb.com/forums/thread150222.html)

Too bad...

Hi. The following calculator will return wrong values for operations which are more complicated than <INTEGER><OPERATION><INTEGER>. I suppose I'm making a mistake in parser.y, but I can't figure out...

$mysql .= mysql_select_db("addressbook", $mysql)
or die (mysql_error());
strip out "$mysql .=". The dot operator is used for concatenating strings, not ressources.

try to begin your code with
<?php

This is the universal, right way of doing it

a) Site-wide (ie "X-Axis") or b) Site and session-wide (ie "X/Y-Axis") ?
a) Sessions (http://www.php.net/manual/en/features.php)
b) shared memory (http://php.net/manual/en/ref.shmop.php) (do not...

you could write a function:

function q($conn,$query) {
$r = @mysql_query(mysql_real_escape_string($query,$conn));
if(!$r) {
throw new Exception(mysql_error($conn));
}
return $r;
}