size of an integer depends on word lenght of an OS ?? IS IT

[yahoo354]

thats what i study in my theorotical books.

But i am confused and bowled!!!

Turbo C on XP.....sizeof int = 2

visual c++ on XP..sizeof int = 4

turbo C++ on XP ...size of int =4

gcc on linux size of int = 4



..... i am also confused with running turbo C on DOC is it because of that it is 2 bytes ??

Can anyone please ellaborate what exactly is word length of an OS

[dmjpro]

thats what i study in my theorotical books.

But i am confused and bowled!!!

Turbo C on XP.....sizeof int = 2

visual c++ on XP..sizeof int = 4

turbo C++ on XP ...size of int =4

gcc on linux size of int = 4



..... i am also confused with running turbo C on DOC is it because of that it is 2 bytes ??

Can anyone please ellaborate what exactly is word length of an OS

Welcome to TSDN.
Actually, the size of Integer dose not depend on OS.
It depends on the environment the Language uses.
Means if the Runtime Environment uses X bit then the length of Integer will be X bit.
A system having X bit means the CPU Register length is X bit.
Look at some example,
Windows now uses 32 bit,DOS uses 16 bit and UNIX uses 32 bit also.

Kind regards,
Dmjpro.

[JosAH]

Welcome to TSDN.
Actually, the size of Integer dose not depend on OS.
It depends on the environment the Language uses.
Means if the Runtime Environment uses X bit then the length of Integer will be X bit.
A system having X bit means the CPU Register length is X bit.
Look at some example,
Windows now uses 32 bit,DOS uses 16 bit and UNIX uses 32 bit also.

Kind regards,
Dmjpro.

PL/1 can use any integer bitsize it wants. C has bit fields as well. It's hardware
that has a 'favourite' bitsize depending on the width of the databus. Most computers
use 32 bits or 64 bits wide databuses. Some of them even impose a bus boundary,
e.g. if the 'favourite' bus width is X bits, those X bits can only be read/written
on X bit address boundaries (b*n%X == 0 is a valid address, where b is the number
of bits in a byte (the smallest addressable unit)).

Languages however can define whatever they want; funny bitwidths need more
support than the 'favourite' bit width. Most of the time the general CPU registers
have the same width as the databus but even that is not always true; e.g. the
old 8088 had 16 bit wide registers but just an 8 bit wide data bus.

kind regards,

Jos

[yahoo354]

Welcome to TSDN.
Actually, the size of Integer dose not depend on OS.
It depends on the environment the Language uses.
Means if the Runtime Environment uses X bit then the length of Integer will be X bit.
A system having X bit means the CPU Register length is X bit.
Look at some example,
Windows now uses 32 bit,DOS uses 16 bit and UNIX uses 32 bit also.

Kind regards,
Dmjpro.

am still not clear!!
windows,DOS,UNIX are OS...hence it does depend on the number of the bits the OS use for integers!! ?? is it what u mean?

[Savage]

am still not clear!!
windows,DOS,UNIX are OS...hence it does depend on the number of the bits the OS use for integers!! ?? is it what u mean?

Yes,it does.
For example DOS is 16bit platform maked to work with procesors that have16bit architecture, so the size of int is 2bytes,on the other hand Windows ,since Win95, is a 32 bit platform maked to work with 32 bit procesor resulting in higher byte size for a int,which is now 4 bytes..

But,if you would try to get size of the int on 64bit procesor which works on 32bit platform,he will just emulate that he have 32bit architecture and size of int would be 4.Which proves that it does depand on OS

Savage