Re: Re: PHP & Hex Numbers

You might consider using BCMath Arbitrary Precision Mathematics Functions <cid:part1.09020605.09030104@webglobe.sk> Jason Teagle wrote:

----- Original Message ----- From: "Jonathan Rosenberg" <jr@tabbysplace.org> To: "Jason Teagle" <jason@teagster.co.uk>; <php-general@lists.php.net> Sent: Monday, June 03, 2002 3:18 PM Subject: RE: [PHP] Re: PHP & Hex Numbers

When doing arithmetic in code, you should always be prepared to handle signed and unsigned.

Thanks for the reply. I figured something like this was going on. But, how does one become "prepared" to handle signed & unsigned integers? Is PHP consistent regarding signed/unsigned when it does arithmetic on integers?

I don't know the answer to that question (yet). What I meant was, we should always be thinking about numbers possibly being negative when treated as signed (which I believe is the default when using numbers for arithmetic), and if necessary account for it. For example, testing if $result < 0 would alert us to the fact that it is probably too large for a signed 32-bit integer, and needs special handling. I don't know if PHP supports a larger integer type (64 bits, for example) - if it does, that helps since you can cast to that type to ensure it is added correctly. -------------------------------------------- _ _

o o    Jason Teagle
<      jason@teagster.co.uk

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