effect of b = a++ + a++

[Ravi]

what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

[Vimal Aravindashan]

Ravi wrote:

what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

Please refer to section 3 (Expressions) of the FAQ. Here is a link to
the same: http://www.c-faq.com/expr/index.html.

Regards,
Vi

[friendfish]

what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

That is "(b= (a++)+(a++))", after that b=2 and a=3;

[Martien Verbruggen]

On Mon, 21 Jan 2008 14:50:43 +0800,
friendfish <fr********@gmail.comwrote:

>

>what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

That is "(b= (a++)+(a++))", after that b=2 and a=3;

Neither the C standard or the FAQ agree with you.

Maybe on your particular compiler it works like that, but you have no
guarantee that it will work like that anywhere else.

See another post in this same thread for a reference to the C FAQ that
explains why you should not do this.

Martien
--
|
Martien Verbruggen | Louis Pasteur's theory of germs is ridiculous
| fiction -- Pierre Pachet, Professor of
| Physiology at Toulouse, 1872

[Joachim Schmitz]

friendfish wrote:

>what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

That is "(b= (a++)+(a++))", after that b=2 and a=3;

Not neccessarily. Read the FAQs as mentioned by a previous poster.

Bye, Jojo

[Randy Howard]

On Mon, 21 Jan 2008 01:14:07 -0600, Joachim Schmitz wrote
(in article <fn**********@online.de>):

friendfish wrote:

>>what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

That is "(b= (a++)+(a++))", after that b=2 and a=3;

Not neccessarily. Read the FAQs as mentioned by a previous poster.

I get this from the compiler:
b.c: In function Œmain¹:
ub.c:10: warning: operation on Œa¹ may be undefined

'May' being an interesting spin on things.

--
Randy Howard (2reply remove FOOBAR)
"The power of accurate observation is called cynicism by those
who have not got it." - George Bernard Shaw

[Kaz Kylheku]

On Jan 20, 3:04*am, Ravi <[e-mail]:

what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

The effect is that it stupefies the reader to the point that he's
unable to read the FAQ or operate the Google search engine.

[Martin Ambuhl]

friendfish wrote:

>

>what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

That is "(b= (a++)+(a++))", after that b=2 and a=3;

No, after that the value of b is undefined. Please learn about sequence
points.

This is yet another example of a tiresome error adequately discussed in
the FAQ. Unfortunately, the same people that "know" what this
ill-formed code means are the same ones who won't bother reading the FAQ
or following the newsgroup before posting.

[CBFalconer]

friendfish wrote:

>

>what is the effect of fllowing code n values of a and b
b = 0;
a = 1;
b = a++ + a++;

That is "(b= (a++)+(a++))", after that b=2 and a=3;

No. The only effect is undefined behaviour. Anything at all can
happen. You could find yourself 6 mos. pregnant (although the
likelihood is probably low).

--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home.att.net>
Try the download section.

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