http://groups.google.com/group/comp.lang.c?hl=en
Today's topics:
* Issue with printing a string - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/26e268149fdbfe14?hl=en
* free c text book advice.. - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/adf51d19d9b07faf?hl=en
* Warning to newbies - 4 messages, 3 authors
http://groups.google.com/group/comp.lang.c/t/9597fd702985dff4?hl=en
* MultiCharts 5.5 crack download - www.top-tradesoft.com - 1 messages, 1
author
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* allocating m bytes dynamically - 2 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/3ce8c1090a941d64?hl=en
* Motivation of software professionals - 1 messages, 1 author
http://groups.google.com/group/comp.lang.c/t/21a3fdec4dd53e6a?hl=en
==============================================================================
TOPIC: Issue with printing a string
http://groups.google.com/group/comp.lang.c/t/26e268149fdbfe14?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Feb 5 2010 7:43 pm
From: Keith Thompson
Michael Foukarakis <electricdelta@gmail.com> writes:
> On Feb 4, 10:13 pm, "Default User" <defaultuse...@yahoo.com> wrote:
>> Michael Foukarakis wrote:
>> > On Feb 4, 2:54 pm, Richard Heathfield <r...@see.sig.invalid> wrote:
>> > > Michael Foukarakis wrote:
>> > > > On Feb 4, 12:08 pm, Richard Heathfield <r...@see.sig.invalid>
>> > > > wrote:
>> > > >> Michael Foukarakis wrote:
>> > > > Indeed. Discussions also need arguments;
>>
>> > > <sigh> Not so's you'd notice.
>>
>> > Worth putting effort into, nonetheless. Trolls get tired, grow up, or
>> > die, eventually.
>>
>> They get tired much faster if you ignore them.
>
> And miss all the fun? :'(
Yes, *please*, do us all a favor and miss the fun.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
==============================================================================
TOPIC: free c text book advice..
http://groups.google.com/group/comp.lang.c/t/adf51d19d9b07faf?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Feb 5 2010 8:12 pm
From: Seebs
On 2010-02-06, Mark Hobley <markhobley@hotpop.donottypethisbit.com> wrote:
> jacob navia <jacob@nospam.org> wrote:
>> Nobody is *forcing* you to use C99.
> Well, in theory no .. but open source is a problem, because people keep
> using code that only works on a specific compiler (although admittedly that
> problem is more to do with GCC than C99.)
As one of the people who has recently written code that really does sorta
require C99 to compile:
In this particular case, it's a pragmatic observation; this code is so
intrinsically anti-portable (it intercepts ordinary library calls and
system calls) that I don't much care. But more generally, everything I've
seen any reason to try to use in the last few years has had the core
C99 parts I care about. That something is theoretically not fully compliant
with the IEEE floating point rules makes no difference to me; everything
I've had cause to use recently has compound literals, designated initializers,
mixed statements and code, declarations in the for loop, C++ comments,
and the officially-blessed struct hack.
-s
--
Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nospam@seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
==============================================================================
TOPIC: Warning to newbies
http://groups.google.com/group/comp.lang.c/t/9597fd702985dff4?hl=en
==============================================================================
== 1 of 4 ==
Date: Fri, Feb 5 2010 8:15 pm
From: spinoza1111
On Feb 6, 12:50 am, Nick Keighley <nick_keighley_nos...@hotmail.com>
wrote:
> On 5 Feb, 08:04,spinoza1111<spinoza1...@yahoo.com> wrote:
>
> > On Feb 5, 1:59 am, Seebs <usenet-nos...@seebs.net> wrote:
> > > On 2010-02-04, Nick Keighley <nick_keighley_nos...@hotmail.com> wrote:
> > > > On 3 Feb, 16:27,spinoza1111<spinoza1...@yahoo.com> wrote:
> > > >> Can't you just let Moore's Law handle "efficiency"?
> > > > interesting question.
>
> > > It is.
>
> > > FWIW: You can't.
>
> > > First off, Moore's Law doesn't expand as fast as some particularly
> > > expensive operations do. Secondly, even if it does expand with the right
> > > big-O relation, it may not expand fast enough to do much good.
>
> <snip>
>
> > [...] your comment is nonsense, and I don't think you
> > understand computational complexity, for if "it" expands with "the
> > right big O relation", then it follows that this is fast
> > enough...
>
> what's the "right" big O notation?
>
> > although in fact, we shouldn't rely on Moore's Law to justify
> > the use of mathematically slow algorithms, and that was not implied by
> > the original post. We weren't discussing buying faster computers so as
> > to code bubble sort, we were discussing running effective algorithms
> > faster.
>
> not all problems have a known "good" (polynomial) algorithm. Think NP
> complete (travelling salesman etc.). I gave you a bunch of examples in
Traveling salesman has a "good" algorithm. It's called simulated
annealling.
> an earlier post of areas where Moore's Law won't bail them out. In
> general waiting for N Moore's law doubling just isn't good enough.
> There's a reason cell phones didn't exist in 1975.
I worked at Motorola in 1979. Years later, a Siemens engineer told me
that the reason Motorola didn't have a marketable cellphone in 1975
was that under Nixon, the FCC was to embroiled in politics as a
consequence of Vietnam and Watergate that it would not release
frequencies needed to implement cellphones.
>
> <snip>
>
> > > a whole lot of devices have issues like "battery life" to think about,
> > > such that reducing CPU usage is still a very valuable endeavor.
>
> good point
>
> <snip>
>
> > > > we might be sad if [garbage collection] happens at an inappropriate moment!
>
> > > Any World of Warcraft player can tell you how much that can matter!
>
> > Computer games and TV ("Baldrick") debase grownup discussions IMO.
>
> games are a commercially important application. If you don't call that
> grownup we'll have to agree to differ.
I don't. I don't call it grown-up when grown men ruin their health and
lives meeting deadlines at Electronic Arts to release another version
of John Madden football. I don't call it grown-up when the US Army
uses a video game to recruit kids.
>
> Even if you don't like games you can think of them as simple (not so
> simple sometimes) physical simulations. Anything written about the
> games problem probably applies to many problems in the physics
> community as well. Those graphical accelerators get used for all sorts
> of odd stuff.
>
> <snip>
== 2 of 4 ==
Date: Fri, Feb 5 2010 10:34 pm
From: spinoza1111
On Feb 5, 5:30 pm, Seebs <usenet-nos...@seebs.net> wrote:
> On 2010-02-05, Richard Heathfield <r...@see.sig.invalid> wrote:
>
> >spinoza1111wrote:
> >> News flash. If you killfile a person, you need to refrain from
> >> discussing that person.
> > I know of no Usenet convention to that effect.
>
> Me neither.
>
> And I've been doing this since before the Great Renaming.
>
> > I'd add an ObC, only I can't think of one.
>
> I'll contribute one.
>
> I recently wanted to write something which would derive a string value,
> then substitute it into another string. Actually, into several other strings.
>
> The problem is that it might be substituted several times, so I couldn't
> just do something like:
>
> char *replace = "replace_here:%s";
>
> and use sprintf.
>
> (In this particular case, the values are "environment variables", but that's
> a detail of no particular relevance to C.)
>
> My solution, which is a bit hacky, but I sorta liked:
>
> struct { char *name, *template; } new_environs[] = {
> { "PERL5LIB", "%s/lib64/perl5/5.10.0/i686-linux:%s/lib64/perl5/5.10.0:%s/lib64/perl5/site _perl/5.10.0/i686-linux:%s/lib64/perl5/site_perl/5.10.0:%s/lib64/perl5/vend or_perl/5.10.0/i686-linux:%s/lib64/perl5/vendor_perl/5.10.0:%s/lib64/perl5/ vendor_perl:." },
> { "LD_LIBRARY_PATH", "%s/lib64:%s/lib:%s/lib64" },
> { 0, 0 }
>
> };
>
> Then, down below:
>
> for (i = 0; new_environs[i].name; ++i) {
> char *new_environ;
> char *t;
> char *u;
> size_t len = strlen(new_environs[i].template) + 5;
> for (s = new_environs[i].template; t = strchr(s, '%'); s = t + 1) {
> len += strlen(parent_path);
> }
> new_environ = malloc(len);
> u = new_environ;
> *u = '\0';
> for (s = new_environs[i].template; t = strchr(s, '%'); s = t + 2) {
> u += snprintf(u, (len - (u - new_environ)), "%.*s%s",
> t - s, s, parent_path);
> }
> snprintf(u, (len - (u - new_environ)), "%s", s);
> setenv(new_environs[i].name, new_environ, 1);
> free(new_environ);
> }
>
> The "setenv" function is a Unixism, which, given a name and a value, makes
> that name/value pair available to future execution.
>
> The calculations are very careless; my goal was not to calculate exactly
> the right length, but rather, to calculate a length which could be easily
> shown to be definitively long enough.
>
> I am, however, pretty happy with this part:
>
> for (s = new_environs[i].template; t = strchr(s, '%'); s = t + 2) {
> u += snprintf(u, (len - (u - new_environ)), "%.*s%s",
> t - s, s, parent_path);
> }
>
> Note that I don't check, in this version, whether it's "%s" or some other
> character after a %. This was one of those "we need something within half
> an hour that will work for this circumstance, we can clean it up tomorrow"
> jobs.
>
> -s
> p.s.: Side note for Unix users: Yes, it's okay to free the argument to
> setenv after passing it in, unlike putenv().
> --
> Copyright 2010, all wrongs reversed. Peter Seebach / usenet-nos...@seebs.nethttp://www.seebs.net/log/<-- lawsuits, religion, and funny pictureshttp://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
== 3 of 4 ==
Date: Fri, Feb 5 2010 11:05 pm
From: Squeamizh
On Feb 4, 10:25 am, Seebs <usenet-nos...@seebs.net> wrote:
> On 2010-02-04, blmblm myrealbox.com <blm...@myrealbox.com> wrote:
>
> > (Quoted to preserve context. I'm rather impressed that Seebs doesn't
> > respond to this sort of thing. I'm not sure I'd be able to resist
> > the temptation to defend -- something.)
>
> A couple of points:
>
> 1. I'm not all *that* strongly autistic, but enough that I don't really
> care whether people are "attacking" me or not.
> 2. I have Nilges plonked.
> 3. Even when I didn't have him plonked, I'd realized after about two tries
> at communicating with him that he was hilarious. I went out of my way to
> wave the autism thing at him to get him to spend weeks trying to insult me
> with it, and the decision to mention the lack of a CS degree was made with
> full awareness that he'd obsess on it for months.
> 4. If behavior is sufficiently predictable, and sufficiently stupid, it is
> not meaningfully an attack.
>
> Basically, if your mom's a drill sergeant, and another kid finds out that
> your mom has combat boots, the ensuing cries of "Your mommy wears combat
> boots!" are not a particularly emotionally significant thing. :)
You're an idiot with regard to the social side of things. You're
pretty good on c-related stuff, perhaps a genius. Anyway, stop posting
about social shit.
== 4 of 4 ==
Date: Fri, Feb 5 2010 11:15 pm
From: Richard Heathfield
Squeamizh wrote (in reply to Seebs):
<snip>
> You're an idiot with regard to the social side of things.
I can think of plenty of worse idiots on the social side of things, and
quite a few of them subscribe to this newsgroup.
> You're pretty good on c-related stuff, perhaps a genius.
I have to agree with you there, although he is by no means infallible.
> Anyway, stop posting about social shit.
I refer you to your own opening sentence.
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
"Usenet is a strange place" - dmr 29 July 1999
Sig line vacant - apply within
==============================================================================
TOPIC: MultiCharts 5.5 crack download - www.top-tradesoft.com
http://groups.google.com/group/comp.lang.c/t/2d40199f91b64f17?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Feb 5 2010 9:20 pm
From: Larry Connelly
~our web address is http://www.top-tradesoft.com/
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==============================================================================
TOPIC: allocating m bytes dynamically
http://groups.google.com/group/comp.lang.c/t/3ce8c1090a941d64?hl=en
==============================================================================
== 1 of 2 ==
Date: Fri, Feb 5 2010 9:47 pm
From: santosh
2005 wrote:
> On Feb 4, 12:02 am, santosh <santosh....@gmail.com> wrote:
> > 2005 wrote:
> > > 1) If I want to allocate m bytes dynamically would the following do?
> > > 2) What is the purpose of the for loop here - assign initial value?
> >
> > > int main(void)
> > > {
> > > int m = 100;
> > > int *ptr = (int *) malloc(m);
> >
> > Note that in C you don't have to cast the return value of malloc/
> > calloc/realloc, since conversion to and from a void pointer is
> > implicit.
>
> Thanks Santosh - but why at
> http://en.wikipedia.org/wiki/Malloc
>
> they are doing it and kind of making a standard ?
One good reason to cast the return of malloc() would be when your code
is likely to be compiled with a C++ compiler. In C++, implicit
conversion to and from void is disallowed, so a cast is needed.
> Another question I have is that should
> ptr[i] = i; this be ptr[i] = 0; instead?
It depends on what you want to do. Your original loop assigned the
value of i to successive elements starting at ptr, but also modified
ptr, which was later passed to free(), so I changed it to analogous
code that didn't modify ptr, so that your free() invocation would not
be UB.
== 2 of 2 ==
Date: Fri, Feb 5 2010 10:08 pm
From: santosh
2005 wrote:
[...]
> Thanks, Santosh, Richard & Ben,
>
> The issue was missing "i++" - I had actually replaced the "m" with
> MAX;
Just a minor point. Your malloc() call in the revised code looks like:
int *ptr = malloc(MAX * sizeof (int));
You might consider instead:
int *ptr = malloc(MAX * sizeof *ptr);
This form ensures that sizeof yields the correct size even if the type
of ptr happens to be changed.
> BTW: what is the deal about size_t num_ints = MAX; // MAX is already
> defined to be 10 - the code runs w/o that line too.
No idea. If the code runs without that line, then why did you include
it?
As an aside, a name like 'num_ints' is more descriptive of purpose
than 'MAX.'
> Also what is this "size_t"?
The parameter to malloc() is defined to be of type size_t. This is
because this is the only type in C that is guaranteed to be able to
represent the size of the largest possible object. It's specifically
meant for holding sizes of objects. sizeof also yields a value to type
size_t. It's an unsigned integral type and is usually a typedef for
unsigned long.
So use size_t if the object is specifically for storing the size of
other objects. OTOH, it's a bit inconvenient in some types of looping
constructs and you need to be careful when mixing it with signed
values in expressions.
> Also why do you say "malloc() and friends" ?
Just a short way of alluding to the other allocation functions:
calloc() and realloc().
> You can click the link to see/run the code: http://codepad.org/8Z8Q3pdo
Note that you've not included the stdio.h header in your code at the
above link, though you use the print() function declared in that
header. You should always include the relevant standard header when
using any function it declares. Not doing so in asking for subtle
problems.
==============================================================================
TOPIC: Motivation of software professionals
http://groups.google.com/group/comp.lang.c/t/21a3fdec4dd53e6a?hl=en
==============================================================================
== 1 of 1 ==
Date: Fri, Feb 5 2010 11:39 pm
From: Roedy Green
On Fri, 5 Feb 2010 04:23:41 -0800 (PST), Richard Cornford
<Richard@litotes.demon.co.uk> wrote, quoted or indirectly quoted
someone who said :
>
>Strange question; the most efficient motivator of professionals is
>money, and money is very popular.
That may be a motivator for taking a job, but I suspect is fairly far
down the list for leaving a job.
Leaving motivations might include:
personality conflict
boredom
too much pressure
Personally, the opportunity to do something I had never done before
was always the top priority. Employers usually want people who have
extensive specific experience.
In hiring, my main interest was loyalty. Employees don't get really
useful until after the first year. I don't expect them to hit the
ground running. I anticipate investing considerable effort in training
them. I looked for reasons why they would likely want to stay.
--
Roedy Green Canadian Mind Products
http://mindprod.com
You can't have great software without a great team, and most software teams behave like dysfunctional families.
~ Jim McCarthy
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