printing address using pointer

[nilesh]

Hello,

I have a basic doubt. Consider following program :

#include<stdio. h>
int main()
{
int i, *ip;
i = 10;
ip = &i;
printf("%x\n", ip);
return 0;
}

When I print the value of ip i.e. the address of integer i, does it
prints the virtual address of integer i or physical address of i ?

TIA
../nilesh

[Ulrich Eckhardt]

Re: printing address using pointer

nilesh wrote:[color=blue]
> int i, *ip;
> i = 10;
> ip = &i;
> printf("%x\n", ip);[/color]

I'm not sure the %x is apropriate here....
[color=blue]
> When I print the value of ip i.e. the address of integer i, does it
> prints the virtual address of integer i or physical address of i ?[/color]

Since C has no concept of virtual vs physical addresses, it can only print
the address it has a concept of, and that is pretty much only 'a location
in memory'.
I would expect it to print the virtual address though(assuming you have
such a memory model on your machine), since virtual addresses are the
thing every program (except the kernel perhaps) should deal with.

Uli

[Joona I Palaste]

Re: printing address using pointer

Ulrich Eckhardt <doomster@knuut .de> scribbled the following:[color=blue]
> nilesh wrote:[color=green]
>> int i, *ip;
>> i = 10;
>> ip = &i;
>> printf("%x\n", ip);[/color][/color]
[color=blue]
> I'm not sure the %x is apropriate here....[/color]

It's not. %p is, and ip should be cast to void *.

--
/-- Joona Palaste (palaste@cc.hel sinki.fi) ------------- Finland --------\
\-------------------------------------------------------- rules! --------/
"I am not very happy acting pleased whenever prominent scientists overmagnify
intellectual enlightenment."
- Anon

[Barry Schwarz]

Re: printing address using pointer

On 31 Oct 2004 21:36:54 -0800, nileshks78@yaho o.com (nilesh) wrote:
[color=blue]
>Hello,
>
>I have a basic doubt. Consider following program :
>
>#include<stdio .h>
>int main()
>{
> int i, *ip;
> i = 10;
> ip = &i;
> printf("%x\n", ip);[/color]

printf("%p\n", (void*)ip);
[color=blue]
> return 0;
>}
>
>When I print the value of ip i.e. the address of integer i, does it
>prints the virtual address of integer i or physical address of i ?
>
>TIA
>./nilesh[/color]



<<Remove the del for email>>

[John Bode]

Re: printing address using pointer

nileshks78@yaho o.com (nilesh) wrote in message news:<29233a5.0 410312136.6e6e9 f8@posting.goog le.com>...[color=blue]
> Hello,
>
> I have a basic doubt. Consider following program :
>
> #include<stdio. h>
> int main()
> {
> int i, *ip;
> i = 10;
> ip = &i;
> printf("%x\n", ip);[/color]

printf ("%p\n", (void*) ip);
[color=blue]
> return 0;
> }
>
> When I print the value of ip i.e. the address of integer i, does it
> prints the virtual address of integer i or physical address of i ?
>[/color]

I'm pretty sure that's specific to the implementation; for example, if
you're running a user program on a *nix or Windows platform, it's
almost certainly a virtual address. If you were running on bare
metal, it would probably be a physical address (then again, if you
were running on bare metal, you probably wouldn't have a working
printf() available anyway).