[OpenBIOS] Fwd: [PATCH] Adds local variable support to OpenBIOS.
Programmingkid
programmingkidx at gmail.com
Sun Sep 2 03:32:19 CEST 2012
On Sep 1, 2012, at 7:51 PM, openbios-request at openbios.org wrote:
> Message: 2
> Date: Fri, 31 Aug 2012 13:40:58 -0500
> From: Tarl Neustaedter <tarl-b2 at tarl.net>
> To: The OpenBIOS Mailinglist <openbios at openbios.org>
> Subject: Re: [OpenBIOS] Fwd: [PATCH] Adds local variable support to
> OpenBIOS.
> Message-ID: <5041053A.90303 at tarl.net>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> On 2012-Aug-31 09:50 , Programmingkid wrote:
>>
>> Are you saying my-variable is better than myVariable?
>
> Yes.
I have changed all my code from camelCase to hyphens.
>
>> How do global variables get you in trouble in recursion? Do you have
>> an example?
>
> Not off-hand, we learn to avoid doing that. To construct one - let's
> take a method doing recursion properly, and break it:
>
> \ Correct way, using stack manipulation
> : fibonacci ( fib -- return ) recursive
> dup 2 >= if ( fib )
> dup 1- fibonnaci ( fib fib-1 )
> swap 2 - fibonnaci ( fib-1 fib-2 )
> + ( fib )
> then ( fib )
> ;
>
> \ Incorrect way - using variable "fib", which will get overwritten
> during recursion
> 0 value fib;
> : fibonnaci ( fib -- return ) recursive
> to fib \ to avoid stack manipulation
> fib 2 < if
> fib exit
> then
> fib 1- fibonnaci ( fib-1)
> fib 2 - fibonnaci ( fib-1 fib-2 )
> + ( fib )
> ;
There is nothing to worry about. All the global variables in my code are only used at compile- time - not during runtime.
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