Xref:	news2.mv.net comp.os.msdos.djgpp:7623
From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: What am i doing wrong?
Date:	Sun, 18 Aug 1996 21:53:53 -0700
Organization:	Three pounds of chaos and a pinch of salt
Lines:	27
Message-ID:	<3217F361.3C2@cs.com>
References:	<199608181702 DOT AA28727 AT mail DOT umu DOT se>
NNTP-Posting-Host:	ppp222.cs.com
Mime-Version:	1.0
To:	Andreas Vernersson <hubble AT hem DOT passagen DOT se>
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Andreas Vernersson wrote:
> 
> Could anyone explain this?[snip]
> I only wants the datastructure to be 2+1=3 bytes...

DJGPP is a 32-bit compiler, which means it uses 32-bit ints.  So your 
structure (packed) is 4 bytes for the int plus 1 byte for the char = 5 
bytes.  Unpacked, the structure is padded to a multiple of 4, for a total 
of 8 bytes.

If you want the struct to be 3 bytes, simply use a short instead of an 
int.

Before you complain, the ANSI spec only says that 
sizeof(short)<=sizeof(int)<=sizeof(long).  Beyond that it's up to the 
compiler.  It's bad programming to depend on an int being any particular 
size.

-- 
John M. Aldrich, aka Fighteer I <fighteer AT cs DOT com>

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