Okay, the curmudgeon's gotta speak.
Generally used to make a null pointer clear, NULL has been simply eye candy
for the value 0.
For twenty years, I've taken this interpretation as well. But recently, I've
been finding places where a comparison against NULL gives different result than
against
I apologize ahead of time for my verbosity. Those who know me rarely involve
me in a conversation without having a pre-arranged escape plan.
Okay, the curmudgeon's gotta speak.
Generally used to make a null pointer clear, NULL has been simply eye
candy
for the value 0.
But recently, I've been
Andrew J. Huang wrote:
This is a really pretty dumb question, but NULL and 0 act
differently using the gnu toolchain. What exactly is the
difference?
Not necessarily a dumb question; it is one of the finer points of C,
since initially you just see lots of references to NULL and only
later
NULL is a pointer and therefor 32 bit long, 0 is an integer and in the
prc-tools, integers are only 16 bit long. So you should see a difference
between (NULL + 0x10) * 0x1000 and (0 + 0x10) * 0x1000. The first should
(as far as I know) be calculated in 32 bit, the other in 16 bit. The
first
Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Logan Shaw
Sent: 23 December 2004 10:19
To: Palm Developer Forum
Subject: Re: Difference between NULL and 0?
Andrew J. Huang wrote:
This is a really pretty dumb question, but NULL and 0 act
differently using the gnu
Okay, the curmudgeon's gotta speak.
Generally used to make a null pointer clear, NULL has been simply eye candy
for the value 0. NULL is often confused with NUL, which is simply eye candy
for the character value of 0. In addition, NULL has been used as a scalar in
logical or symbolic math
Jeffry Loucks wrote:
Okay, the curmudgeon's gotta speak.
Anybody want to talk about true and false?
Well, not exactly. But I have a question: I recently wrote a
set of fixed-point math functions (24 to the left and 8 to the
right) and defined ceil(a) as (a 8) + !!(a 0xff).
So my question
:)
Jeff Loucks
Work 425-284-1128 [EMAIL PROTECTED]
Home 253-851-8908 [EMAIL PROTECTED]
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-Original Message-
From: Logan Shaw [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 23, 2004 12:15 PM
To: Palm Developer Forum
Subject: Re: Difference between NULL and 0
