use of volatile ?

[parasprajapati2001]

can any one give an example which use volatile keyword ?

[Chris Dollin]

pa****************@gmail.com wrote:

can any one give an example which use volatile keyword ?

Voila:

#include <signal.h>

volatile sig_atomic_t bromine;

What did you really want to know, and why?

--
Chris "small steps" Dollin

Hewlett-Packard Limited registered office: Cain Road, Bracknell,
registered no: 690597 England Berks RG12 1HN

[Matthew Hicks]

One case is for the variables only accessed inside an interrupt service routine.
---Matthew Hicks

can any one give an example which use volatile keyword ?

[Army1987]

<pa****************@gmail.comha scritto nel messaggio news:11**********************@i38g2000prf.googlegr oups.com...

can any one give an example which use volatile keyword ?

It serves to declare a variable which could change behind the
program's back, so the program must access it whenever the abstract
machine does.

For example:
#include <time.h>
double measure_time(int (*func)(int), int min, int max)
{
clock_t t0, t1;
volatile int res;
int i;
double el0, el1;
t0 = clock();
for (i = min; i <= max; i++)
res = func(i);
t1 = clock();
el0 = (t0 - t1) / ((double)max - min + 1) / CLOCKS_PER_SEC;
t0 = clock();
for (i = min; i <= max; i++)
res = 0;
t1 = clock();
el1 = (t0 - t1) / ((double)max - min + 1) / CLOCKS_PER_SEC;
return el0 - el1;
/* the time needed for the first loop including function calls,
* minus the time needed for the loop itself */
}

If res weren't volatile, and func() had no side effect, the
compiler would be free to optimize away all the calls to func()
except the last one, as they would be useless and no strictly
conforming program could determine that they weren't actually
executed.

[satish]

i will give u an example...

void getio()
{
char *ioport=0x7777;
volatile char ch=ioport; /* read first byte of data*/
ch=ioport; /* read second byte of data*/
}
if u declare datatype as volatile the compiler optimization will not
remove the
redundant expressions as above.....

[Keith Thompson]

satish <sa*******@gmail.comwrites:

i will give u an example...

void getio()
{
char *ioport=0x7777;
volatile char ch=ioport; /* read first byte of data*/
ch=ioport; /* read second byte of data*/
}
if u declare datatype as volatile the compiler optimization will not
remove the
redundant expressions as above.....

You should try compiling any code before you post it here.

char *ioport=0x7777;
attempts to initialize a pointer with an integer. There is no
implicit conversion from pointer types to integer types (except for
the special case of a null pointer constant). This is a constraint
violation, requiring a diagnostic from the compiler (though some
compilers may accept it anyway).

volatile char ch=ioport;
Here you initalize a char object with a pointer value. See above.

ch=ioport;
And again.

Also, please don't use silly abbreviations like "u". This isn't a
chat room.

--
Keith Thompson (The_Other_Keith) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[CBFalconer]

satish wrote:

>
i will give u an example...

Who are i and u? If i is supposed to reference you, it is spelled
'I'. 'u' is totally unknown, even 'U' has not posted here for at
least a year.

In other words, don't use geek speek in Usenet.

--
<http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.txt>
<http://www.securityfocus.com/columnists/423>
<http://www.aaxnet.com/editor/edit043.html>
cbfalconer at maineline dot net

--
Posted via a free Usenet account from http://www.teranews.com

[Richard Heathfield]

CBFalconer said:

satish wrote:

>>
i will give u an example...

Who are i and u? If i is supposed to reference you, it is spelled
'I'. 'u' is totally unknown, even 'U' has not posted here for at
least a year.

In other words, don't use geek speek in Usenet.

I always wondered what a geek was. Now I know - it's someone who can't
type.

--
Richard Heathfield <http://www.cpax.org.uk>
Email: -www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[Christopher Benson-Manica]

Richard Heathfield <rj*@see.sig.invalidwrote:

I always wondered what a geek was. Now I know - it's someone who can't
type.

Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

--
C. Benson Manica | I *should* know what I'm talking about - if I
cbmanica(at)gmail.com | don't, I need to know. Flames welcome.

[Clever Monkey]

Richard Heathfield wrote:

CBFalconer said:

>satish wrote:

>>i will give u an example...

Who are i and u? If i is supposed to reference you, it is spelled
'I'. 'u' is totally unknown, even 'U' has not posted here for at
least a year.

In other words, don't use geek speek in Usenet.

I always wondered what a geek was. Now I know - it's someone who can't
type.

Not according to the canonical definition:
<http://catandgirl.com/view.php?loc=94>
--
clvrmnky <mailto:sp******@clevermonkey.org>

Direct replies will be blacklisted. Replace "spamtrap" with my name to
contact me directly.

[Richard Bos]

Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

Richard Heathfield <rj*@see.sig.invalidwrote:

I always wondered what a geek was. Now I know - it's someone who can't
type.

Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

Richard

[Joe Wright]

Richard Bos wrote:

Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

>Richard Heathfield <rj*@see.sig.invalidwrote:

>>I always wondered what a geek was. Now I know - it's someone who can't
type.

Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

Richard

That's good. If you answer 'two' you're a geek.

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---

[Flash Gordon]

Clever Monkey wrote, On 03/07/07 15:14:

Richard Heathfield wrote:

>CBFalconer said:

>>satish wrote:
i will give u an example...
Who are i and u? If i is supposed to reference you, it is spelled
'I'. 'u' is totally unknown, even 'U' has not posted here for at
least a year.

In other words, don't use geek speek in Usenet.

I always wondered what a geek was. Now I know - it's someone who can't
type.

Not according to the canonical definition:
<http://catandgirl.com/view.php?loc=94>

Based on that and my salary I am a nerd rather than a geek. However, my
definitions of the difference would be more that a geek knows and
accepts what s/he is, a nerd does not. Or, "the difference between a
geek and a nerd is that a geek knows the difference between a geek and a
nerd." Also nerd still tends to be considered an insult whereas geek
tends to be more a statement of what one is.
--
Flash Gordon
Definitely either a geek or a nerd, which depends on your definition.

[Chris Dollin]

Richard Bos wrote:

Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

>Richard Heathfield <rj*@see.sig.invalidwrote:

I always wondered what a geek was. Now I know - it's someone who can't
type.

Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

Why should I answer such an ambiguous question?

--
Singularly Plural Hedgehog
"A facility for quotation covers the absence of original thought." /Gaudy Night/

[Keith Thompson]

rl*@hoekstra-uitgeverij.nl (Richard Bos) writes:

Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

>Richard Heathfield <rj*@see.sig.invalidwrote:

I always wondered what a geek was. Now I know - it's someone who can't
type.

Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

Two, of course, but isn't it usually spelled with a 'k' and preceded
by Brekekekex?

--
Keith Thompson (The_Other_Keith) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[Army1987]

"Joe Wright" <jo********@comcast.netha scritto nel messaggio news:hJ******************************@comcast.com. ..

Richard Bos wrote:

>Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

>>Richard Heathfield <rj*@see.sig.invalidwrote:

I always wondered what a geek was. Now I know - it's someone who can't type.
Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

Richard

That's good. If you answer 'two' you're a geek.

Hey, I'm a geek!
(Actually, I'm not a native English speaker, and I hadn't heard of that word before. I thought it was pronounced with two syllable
because of what I guessed it meant. A Wikipedia search shown that
my guess was right, but why should a non-geek pronounce it as one
syllable?)

[Christopher Benson-Manica]

Army1987 <pl********@for.itwrote:

How many syllables are there in the word "coax"?

why should a non-geek pronounce it as one syllable?

Because the one syllable word has a non-geek meaning.

--
C. Benson Manica | I *should* know what I'm talking about - if I
cbmanica(at)gmail.com | don't, I need to know. Flames welcome.

[Keith Thompson]

"Army1987" <pl********@for.itwrites:

"Joe Wright" <jo********@comcast.netha scritto nel messaggio
news:hJ******************************@comcast.com. ..

>Richard Bos wrote:

[...]

>>Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

That's good. If you answer 'two' you're a geek.

Hey, I'm a geek! (Actually, I'm not a native English speaker, and I
hadn't heard of that word before. I thought it was pronounced with
two syllable because of what I guessed it meant. A Wikipedia search
shown that my guess was right, but why should a non-geek pronounce
it as one syllable?)

To a geek, "coax" is short for "coaxial", as in "coaxial cable".

To a non-geek, it's an ordinary non-technical word meaning "to attempt
to influence by gentle persuasion, flattery, etc.; cajole", pronounced
as one syllable with a long 'o'. See
<http://dictionary.reference.com/browse/coax>.

I tried to use Babelfish to get an Italian translation, but it
translates "coax" as "coassiale", which it translates back to English
as "coaxial". (Apparently the folks who implemented Babelfish are
geeks; who would have guessed?) But it translates "coaxing" as
"persuadere con le lusinghe", which re-translates to "to persuade with
flatteries".

--
Keith Thompson (The_Other_Keith) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[CBFalconer]

Joe Wright wrote:

Richard Bos wrote:

>Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

>>Richard Heathfield <rj*@see.sig.invalidwrote:

I always wondered what a geek was. Now I know - it's someone
who can't type.

Whew, that lays to rest my long-standing fears that I was one.
Now I can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

That's good. If you answer 'two' you're a geek.

I think there are very few participants here who even considered
the one syllable version. We don't coax, we ramrod :-)

--
<http://www.cs.auckland.ac.nz/~pgut001/pubs/vista_cost.txt>
<http://www.securityfocus.com/columnists/423>
<http://www.aaxnet.com/editor/edit043.html>
cbfalconer at maineline dot net

--
Posted via a free Usenet account from http://www.teranews.com

[Army1987]

"Keith Thompson" <ks***@mib.orgha scritto nel messaggio news:ln************@nuthaus.mib.org...

To a geek, "coax" is short for "coaxial", as in "coaxial cable".

To a non-geek, it's an ordinary non-technical word meaning "to attempt
to influence by gentle persuasion, flattery, etc.; cajole", pronounced
as one syllable with a long 'o'. See
<http://dictionary.reference.com/browse/coax>.

I tried to use Babelfish to get an Italian translation, but it
translates "coax" as "coassiale", which it translates back to English

That's why I guessed the way I did...

as "coaxial". (Apparently the folks who implemented Babelfish are
geeks; who would have guessed?) But it translates "coaxing" as
"persuadere con le lusinghe", which re-translates to "to persuade with
flatteries".

There are far more common ways to say that in Italian, even with a
single verb. (I've never used Babelfish, except once to get to
understand a japanese text. It didn't translate it into *real*
English, but at least was understandable.)

[Richard Bos]

Keith Thompson <ks***@mib.orgwrote:

rl*@hoekstra-uitgeverij.nl (Richard Bos) writes:

Christopher Benson-Manica <at***@otaku.freeshell.orgwrote:

Richard Heathfield <rj*@see.sig.invalidwrote:
I always wondered what a geek was. Now I know - it's someone who can't
type.

Whew, that lays to rest my long-standing fears that I was one. Now I
can go rejoin society...

Answer this question quickly, and don't think about it beforehand:

How many syllables are there in the word "coax"?

Two, of course, but isn't it usually spelled with a 'k' and preceded
by Brekekekex?

Have you been lurking in the Shedde?

Richard