Hi Everyone,
I have the following code,
int main()
{
int p[] = {10,20,30,40,50 };
int *i = &p[0];
printf("before : %p\n",(void*)i) ;
printf("1 %d %d\n",*++i,*i++ );
printf("after : %p\n",(void*)i) ;
}
As per my understanding, arguements to a function call are passed from
right most to left most one, so in this case *i++ will be processed
first and then *++i, hence i expect the output to be
1 30 10
where as the output is
1 20 10
Can anybody explain as to why this is happening?
20  1800 
In article <11************ *********@a3g20 00cwd.googlegro ups.com>,
<sa*****@yahoo. co.inwrote:
I have the following code,
int main()
{
int p[] = {10,20,30,40,50 };
int *i = &p[0];
printf("before : %p\n",(void*)i) ;
printf("1 %d %d\n",*++i,*i++ );
printf("after : %p\n",(void*)i) ;
}
>As per my understanding, arguements to a function call are passed from
right most to left most one, so in this case *i++ will be processed
first and then *++i,
Your understanding is incorrect. C does not define the order of
evaluation of arguments to functions.
Your code is also nonconforming, as it modifies i twice between
sequence points.
I suspect you'd find this kind of topic discussed in depth in the
FAQ.
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest
>
Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
I find its a bit confusing from C FAQ...
In article <11************ *********@n67g2 000cwd.googlegr oups.com>,
<sa*****@yahoo. co.inwrote:
>Your code is also nonconforming, as it modifies i twice between
sequence points.
>Can you explain a bit more about the sequence points with some example?
I find its a bit confusing from C FAQ...
Sorry, I don't have time for that at the moment. Some of the details
can get confusing; even the experts here sometimes need long threads
to decide exactly what "should" happen in some of the situations.
Probably someone will offer some links that describe sequence
points in more detail.
--
Okay, buzzwords only. Two syllables, tops. -- Laurie Anderson sa*****@yahoo.c o.in wrote:
Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
I find its a bit confusing from C FAQ...
Ask some specific questions, with reference to the relevant part of the
FAQ and I'm sure someone(s) will try and clarify. sa*****@yahoo.c o.in wrote:
>Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
I find its a bit confusing from C FAQ...
If you explain what problem you have with the FAQs explanation, we
can help you understand it.
--
Chris "HO. HO. HO." Dollin
"People are part of the design. It's dangerous to forget that." /Star Cops/ sa*****@yahoo.c o.in said:
>
>>
Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
Imagine this is a sequence point: #SP1943#
here's some C code, ++ and * and / and + and maybe a few ()
Here's another sequence point: #SP1944#
Everything in between the two sequence points can't /start/ happening until
SP1943 has been reached. By the time we get to SP1944, it must already have
happened. But between those two points, C doesn't care what order things
happen in, as long as all the right things happen.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at the above domain, - www.
Richard Heathfield a écrit :
sa*****@yahoo.c o.in said:
>>>Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
Imagine this is a sequence point: #SP1943#
here's some C code, ++ and * and / and + and maybe a few ()
Here's another sequence point: #SP1944#
Everything in between the two sequence points can't /start/ happening until
SP1943 has been reached. By the time we get to SP1944, it must already have
happened. But between those two points, C doesn't care what order things
happen in, as long as all the right things happen.
This is not true
jacob navia said:
Richard Heathfield a écrit :
>sa*****@yahoo.c o.in said:
>>>>Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
Imagine this is a sequence point: #SP1943#
here's some C code, ++ and * and / and + and maybe a few ()
Here's another sequence point: #SP1944#
Everything in between the two sequence points can't /start/ happening
until SP1943 has been reached. By the time we get to SP1944, it must
already have happened. But between those two points, C doesn't care what
order things happen in, as long as all the right things happen.
This is not true
It is possible that I am mistaken, but you have not made it clear why you
think this is so. Please do so.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at the above domain, - www.
jacob navia <ja***@jacob.re mcomp.frwrites:
Richard Heathfield a écrit :
>sa*****@yahoo.c o.in said:
>>>>Your code is also nonconforming, as it modifies i twice between
sequence points.
Can you explain a bit more about the sequence points with some example?
Imagine this is a sequence point: #SP1943#
here's some C code, ++ and * and / and + and maybe a few ()
Here's another sequence point: #SP1944#
Everything in between the two sequence points can't /start/
happening until SP1943 has been reached. By the time we get to
SP1944, it must already have happened. But between those two points,
C doesn't care what order things happen in, as long as all the right
things happen.
This is not true
Pretend that the above was written by someone other than Richard
Heathfield, and reconsider your opinion.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
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