variable storage

[kanalkannan]

Hi,
I have heard a question in C data storage i want to know where
the auto,static and global variables are get stored and what are the
memory segments like stack heap and its allocation.

waiting for reply.

[santosh]

kanalkannan wrote:

Hi,
I have heard a question in C data storage i want to know where
the auto,static and global variables are get stored and what are the
memory segments like stack heap and its allocation.

waiting for reply.

These details are specific to the compiler and it's target system.

[Wang Jiaji]

On Jan 7, 3:35 pm, kanalkannan <m.selvakan...@ gmail.comwrote:

Hi,
I have heard a question in C data storage i want to know where
the auto,static and global variables are get stored and what are the
memory segments like stack heap and its allocation.

waiting for reply.

They're compiler specific and not very important, you can create your
own segment, with any name you like.

[Keith Thompson]

Wang Jiaji <ji********@gma il.comwrites:

On Jan 7, 3:35 pm, kanalkannan <m.selvakan...@ gmail.comwrote:

>Hi,
I have heard a question in C data storage i want to know where
the auto,static and global variables are get stored and what are the
memory segments like stack heap and its allocation.

waiting for reply.

They're compiler specific

True.

and not very important,

Probably true, though they might be important in some contexts.

you can create your
own segment, with any name you like.

Oh? C has no concept of "segments". Any mechanism for creating your
own would be extremely system-specific.

--
Keith Thompson (The_Other_Keit h) <ks***@mib.or g>
[...]
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[Randy Howard]

On Mon, 7 Jan 2008 09:42:10 -0600, Keith Thompson wrote
(in article <87************ @kvetch.smov.or g>):

Wang Jiaji <ji********@gma il.comwrites:

>you can create your
own segment, with any name you like.

Oh? C has no concept of "segments". Any mechanism for creating your
own would be extremely system-specific.

int segment; /* this is my segment, there are many like it
* but this one is mine.
*/


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

[user923005]

On Jan 6, 11:35*pm, kanalkannan <m.selvakan...@ gmail.comwrote:

Hi,
* * * * I have heard a question in C data storage i want to know where
the auto,static and global variables are get stored and what are the
memory segments like stack heap and its allocation.

All auto variables are placed into automatic storage.
All variables allocated with malloc() or calloc() are placed in
allocated storage.
All variables that are static or global have static duration.

Stack and heap do not appear in the standard. Many compilers place
automatic storage on a stack. Many compilers place allocated storage
on a heap. From the C language's perspective, understanding of the
physical location is not necessary to use the memory. There is no
imporant reason that all three types of storage could not be in the
same type of physical structures and general locations.

If you really want to know where something resides, take the address
of it (unless it is already an address) and (after casting to void *)
print the address with a %p format specifier. That will tell you
where the variable is located. Of course, it could be a symbolic
address running in a virtual machine, but that's neither here nor
there. You would get the compiler's view of where the data lives
exactly in any case.