How Sizeof Operator Implemented?

hiren · 09-28-2004, 11:30 PM

Dear Memebers,

I want to know how the Sizeof Operator is implemented and also What does matter when deciding the size of Interger?

Why it is 2 bytes in Windows and 4 bytes in Linux? Is there any Hardware configuration or Is it depends upon a software(i.e. Compiler)?

Could anyone help me out? I have tried searching on Net but couldn't able to find out.

Thank you,
Hiren Gajjar.

vinay_s_s · 09-29-2004, 12:37 AM

hi hiren, its depends on the implementation of the OS 16 bit or 32 bit.

size of int = 1 word

1 word = 2 bytes in a 16 bit system
1 word = 4 bytes in a 32 bit system

Linux is a 32bit
DOS is 16 bit

vinay_s_s · 09-29-2004, 12:39 AM

oh windows is also 32 bit - get a windows compiler (borland c++ fow windows o something like that) and test it out if u want.
The turboc made for dos, runs under dos so u get 2 bytes even on dos prompt in windows

hiren · 09-29-2004, 02:47 AM

Thanks for your reply.

Does it means that if OS is 64 bits than int is 8 bytes? Any other factors?

Thank you,
Hiren Gajjar.

-mk- · 09-29-2004, 05:12 AM

see:
http://www.flipcode.com/cgi-bin/msg....3dtheory&id=-1

-mk-