On Mon, 2008-09-29 at 12:42 +0530, nidhi mittal wrote:
> Hi all
> its a very basic ques may be for many of you .but i have this
> confusion from long that is.
> when we say this application is 32 bit application or 64 bit what do
> we mean by that
> is it processor which is 32 bit or 64 bit
Primarily it is that.
> or the OS which is is 32 bit or 64 bit
Secondarily that too. But x86_64/amd64/em64t/intel64 has x86
compatibility (and Sparc64 for Sparc perhaps too).
So can install and run a 64bit kernel and run the whole userspace
compiled for 64bit. Or you can run only 32bit apps/libs in userspace on
64bit kernel (because your apps do not need > 4GB address space but you
have 64GB RAM in your hardware).
> or what ?
Basically yes. But x86/64/AMD64/EM64T/... can run x86 32bit apps too (if
the necessary libs are installed).
> 2. Does it have some relation that in windows in C language int size
According to the C standard, sizeof(int) is the native register width.
And that is basically defined by the CPU. So if sizeof(int) == 2, you
probably have some 16bit microcontroller.
And at least for WinNT and XP, sizeof(int) == 4 on "normal PCs" BTW.
> is 2 bytes in linux gcc it is 4 bytes
> i mean any relation of word size with it ??
Yup.
Bernd
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