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Path: utzoo!linus!decvax!harpo!eagle!alice!rabbit!mjs
From: mjs@rabbit.UUCP
Newsgroups: net.lang.c
Subject: Re: bit fields in C
Message-ID: <1794@rabbit.UUCP>
Date: Sat, 13-Aug-83 11:13:28 EDT
Article-I.D.: rabbit.1794
Posted: Sat Aug 13 11:13:28 1983
Date-Received: Sat, 13-Aug-83 19:49:28 EDT
References: <631@ihuxf.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 27

Independent of what K&R says, real compilers may or may not adhere.  On
many compilers, the program below prints: "sbit: -1; ubit: 1".  Thus,
many real compilers do not compile C.
/*
** bits.c: determine signedness of signed and unsigned bit fields.
*/
struct	sbit
{
	int	sbit : 1;
};
struct	ubit
{
	unsigned ubit : 1;
};
main()
{
	struct	sbit	sbit;
	struct	ubit	ubit;
	sbit.sbit = 1;
	ubit.ubit = 1;
	printf("sbit: %d; ubit: %d\n", sbit.sbit, ubit.ubit);
	exit(0);
}
-- 
	Marty Shannon
UUCP:	{alice,rabbit,research}!mjs
Phone:	201-582-3199