On Wed, Oct 21, 2009 at 8:32 AM, Rick Brown <rick.brown.3@xxxxxxxxx> wrote:
When they say its 32/64 bit machine its the capability of the system or processor to process so many bits at once !
No ... 32 bit OS can run anything <= 32 bit
yes thats right !
Not sure about this let others have their say !
Please correct me if i am wrong !
Hi,
Firstly, I'm trying to understand what exactly characterizes a
procesor or an operating system as 32bit / 64 bit. I've read that it
means the "native word size" of a machine. But what exactly is that?
Register size? Address bus size? Anything else?
When they say its 32/64 bit machine its the capability of the system or processor to process so many bits at once !
Secondly, I'm trying to understand what exactly does a sizeof(int)
depend on when we say it is "platform specific". Is it dependent of
compiler being 32bit / 64 bit? Or the OS being 32bit / 64 bit? Or the
processor being 32 / 64 bit?
its dependent on processor being 32/64 bit
Lastly, How are "sizes" of compiler / OS / processor inter related?
Here is my understanding. A 32 bit processor can only be running a 32
bit OS.
No ... 32 bit OS can run anything <= 32 bit
A 64 bit processor may run a 32 or a 64 bit OS.
yes thats right !
A 32 bit
compiler genrates code only to be run on a 32 bit OS; ditto for 64
bit.
Not sure about this let others have their say !
Is this right?
Please correct me if i am wrong !
TIA,
Rick
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