what exactly does the operator |= ???

[Erick->]

hello!!

I was looking at some code in C... and saw this "exotic" operator |=.

first time with it, what exactky does???

thanks in advance.
Erick->

[Richard Heathfield]

Keith Thompson said:

Richard Heathfield <in*****@invali d.invalidwrites :

>Erick-said:

>>do you want to see this book?? with the page NUMBER 50 with the first
line: "Chapter 3 - Control Flow" ???

If that is the case, then it isn't the book I suggested you consult, i.e.
K&R2. Clearly, if you consult some other book, my page reference will not
be valid, but it is certainly valid for the book I suggested.

Are there different printings of K&R2 with different page numbering?

No.

There have been two major editions of K&R (Kernighan & Ritchie, _The C
Programming Language_). The first edition is now mostly of historical
interest. The second edition describes the language standardized by
the 1989 ANSI standard and the 1990 ISO standard. (There are no plans
for a new edition covering the 1999 standard.)

There was also an interim edition, based on the ANSI C draft - and it turned
out to be identical to the second edition.

Even the hardback version (which I also have) has identical page-numbering.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: normal service will be restored as soon as possible. Please do not
adjust your email clients.

[Mark McIntyre]

On Fri, 17 Nov 2006 20:35:02 GMT, in comp.lang.c , Keith Thompson
<ks***@mib.orgw rote:

>Richard Heathfield <in*****@invali d.invalidwrites :

>Erick-said:

>>do you want to see this book?? with the page NUMBER 50 with the first
line: "Chapter 3 - Control Flow" ???

If that is the case, then it isn't the book I suggested you consult, i.e.
K&R2. Clearly, if you consult some other book, my page reference will not
be valid, but it is certainly valid for the book I suggested.

Are there different printings of K&R2 with different page numbering?

He may be looking at a non-English impression, which would most likely
have different page numbering.

>Erick, if you're looking at the first edition, you should get a copy
of the second edition.

Page 50 of K&R (1978) starts with the words "similarly, the order in
which..." and talks about function argument evaluation order.

--
Mark McIntyre

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it."
--Brian Kernighan

[Mark McIntyre]

On Fri, 17 Nov 2006 20:57:31 +0000, in comp.lang.c , Richard
Heathfield <in*****@invali d.invalidwrote:

>Keith Thompson said:

>Are there different printings of K&R2 with different page numbering?

No.

Absurd claim.

One might reasonably expect foreign language copies to have different
page numbering, and indeed a UK pressing might well be different to a
US one, or a reprint on smaller pagesize, or...

>Even the hardback version (which I also have) has identical page-numbering.

Perhaps, but as with the output of compilers, empirical evidence of
your particular environment is not a general proof.

--
Mark McIntyre

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it."
--Brian Kernighan

[Coos Haak]

Op Fri, 17 Nov 2006 22:53:19 +0000 schreef Mark McIntyre:

<snip>

Page 50 of K&R (1978) starts with the words "similarly, the order in
which..." and talks about function argument evaluation order.

That's on the middle of page 53.
Page 50 begins with the header '2.10 Assignment Operators...' as I wrote
earlier.
I have the paperback version of 1988, ISBN 0-13-110362-8.
Bought for nearly EUR 50 in 2003.
--
Coos

[Keith Thompson]

Mark McIntyre <ma**********@s pamcop.netwrite s:

On Fri, 17 Nov 2006 20:35:02 GMT, in comp.lang.c , Keith Thompson
<ks***@mib.orgw rote:

>>Richard Heathfield <in*****@invali d.invalidwrites :

>>Erick-said:
do you want to see this book?? with the page NUMBER 50 with the first
line: "Chapter 3 - Control Flow" ???

If that is the case, then it isn't the book I suggested you consult, i.e.
K&R2. Clearly, if you consult some other book, my page reference will not
be valid, but it is certainly valid for the book I suggested.

Are there different printings of K&R2 with different page numbering?

He may be looking at a non-English impression, which would most likely
have different page numbering.

>>Erick, if you're looking at the first edition, you should get a copy
of the second edition.

Page 50 of K&R (1978) starts with the words "similarly, the order in
which..." and talks about function argument evaluation order.

It's the same in my copy of K&R1. That's the last page of the section
on Precedence and Order of Evaluation. Chapter 3, on Control Flow,
starts on page 51.

In my copy of K&R2, page 50 is the first page of the section on
Assignment Operators and expressions; chapter 3, on Control Flow,
starts on page 55.

Either Erick has made a mistake (hey, it happens), or he has some
other edition.

There are a multitude of translations into languages other than
English; see <http://cm.bell-labs.com/cm/cs/cbook/>. That page
mentions that many of the errata have been corrected in recent
printings; it's plausible that some of those corrections might have
caused page shifts (though probably not from 50 to 55, assuming we're
talking about K&R2).

--
Keith Thompson (The_Other_Keit h) 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.

[Richard Heathfield]

Mark McIntyre said:

On Fri, 17 Nov 2006 20:35:02 GMT, in comp.lang.c , Keith Thompson
<ks***@mib.orgw rote:

>>Richard Heathfield <in*****@invali d.invalidwrites :

>>Erick-said:
do you want to see this book?? with the page NUMBER 50 with the first
line: "Chapter 3 - Control Flow" ???

If that is the case, then it isn't the book I suggested you consult,
i.e. K&R2. Clearly, if you consult some other book, my page reference
will not be valid, but it is certainly valid for the book I suggested.

Are there different printings of K&R2 with different page numbering?

He may be looking at a non-English impression, which would most likely
have different page numbering.

That is entirely possible. If it is in fact the case, then I owe the OP an
apology.

>>Erick, if you're looking at the first edition, you should get a copy
of the second edition.

Page 50 of K&R (1978) starts with the words "similarly, the order in
which..." and talks about function argument evaluation order.

And in any case, I specified K&R2, not K&R.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: normal service will be restored as soon as possible. Please do not
adjust your email clients.

[Richard Heathfield]

Mark McIntyre said:

On Fri, 17 Nov 2006 20:57:31 +0000, in comp.lang.c , Richard
Heathfield <in*****@invali d.invalidwrote:

>>Keith Thompson said:

>>Are there different printings of K&R2 with different page numbering?

No.

Absurd claim.

I thought I was supposed to be in your killfile.

One might reasonably expect foreign language copies to have different
page numbering, and indeed a UK pressing might well be different to a
US one, or a reprint on smaller pagesize, or...

Yes, it's true that I hadn't considered that possibility.

>>Even the hardback version (which I also have) has identical
page-numbering.

Perhaps, but as with the output of compilers, empirical evidence of
your particular environment is not a general proof.

Do you have a counter-example in English?

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: normal service will be restored as soon as possible. Please do not
adjust your email clients.

[J. J. Farrell]

Coos Haak wrote:

Op Fri, 17 Nov 2006 22:53:19 +0000 schreef Mark McIntyre:

<snip>

Page 50 of K&R (1978) starts with the words "similarly, the order in
which..." and talks about function argument evaluation order.

That's on the middle of page 53.
Page 50 begins with the header '2.10 Assignment Operators...' as I wrote
earlier. I have the paperback version of 1988, ISBN 0-13-110362-8.
Bought for nearly EUR 50 in 2003.

You're talking about K&R2. Mark was talking about K&R, since the most
likely cause of the confusion was that the OP looked at K&R rather than
the K&R2 which Richard specified. It looks like the OP's printing
differs from both the common standard editions.

[Mark McIntyre]

On Fri, 17 Nov 2006 23:41:24 +0000, in comp.lang.c , Richard
Heathfield <in*****@invali d.invalidwrote:

>Mark McIntyre said:

>On Fri, 17 Nov 2006 20:57:31 +0000, in comp.lang.c , Richard
Heathfield <in*****@invali d.invalidwrote:

>>>Even the hardback version (which I also have) has identical
page-numbering.

Perhaps, but as with the output of compilers, empirical evidence of
your particular environment is not a general proof.

Do you have a counter-example in English?

Thats irrelevant, and you know it as well as I do. And for what its
worth the OP had a book with different page numbering to you so we
already have an example (*)

I'm sorry Richard, but you're being foolish, and you know it.
(*) a petty minded person would at this point claim that the OP must
have been referring to a different book. Naturally, the petty-minded
person cannot possibly be mistaken, clearly only everyone else can be
wrong.
--
Mark McIntyre

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it."
--Brian Kernighan

[Mark McIntyre]

On Sat, 18 Nov 2006 00:34:16 +0100, in comp.lang.c , Coos Haak
<ch*****@hccnet .nlwrote:

>Op Fri, 17 Nov 2006 22:53:19 +0000 schreef Mark McIntyre:

<snip>

>Page 50 of K&R (1978) starts with the words "similarly, the order in
which..." and talks about function argument evaluation order.

That's on the middle of page 53.
Page 50 begins with the header '2.10 Assignment Operators...' as I wrote
earlier.
I have the paperback version of 1988, ISBN 0-13-110362-8.
Bought for nearly EUR 50 in 2003.

Thats K&R2. Note that I said K&R(1978)

--
Mark McIntyre

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it."
--Brian Kernighan