Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ulysses!cjc
From: cjc@ulysses.att.com (Chris Calabrese)
Newsgroups: comp.lang.c
Subject: Re: Enumerated types... what's the point?
Summary: ordering is defined by ansi
Keywords: C, enum
Message-ID: <12719@ulysses.att.com>
Date: 24 Mar 90 00:06:47 GMT
References: <1480@mountn.dec.com>
Distribution: usa
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 23

In article <1480@mountn.dec.com>, wallis@labc.dec.com (Barry L. Wallis) writes:
| Is ordering defined on type enum? I have a book on Turbo-C (can't remember the
| title but it's published by Howard Sams) which says that ordering on the
| elements of an enum is undefined. For example, enum { JAN, FEB, MAR } months
| would make the comparison (FEB > JAN) illegal! I don't believe this is reality
| in Turbo-C, but, I'm currently 1700 miles from my PC and library. 

| Barry L. Wallis			USENET: wallis@labc.dec.com
| Database Consultant		Prodigy (don't laugh): DNMX41A
| U.S. DECtp Resource Center	DECUServe: EISNER::WALLIS (not on the net yet)
| Los Angeles, CA			"No one voted for me, I represent myself"

If I remember correctly, ANSI says that the enums are to be stored as
ints and that they are ordered from 0 to n, unless the programmer
states otherwise (I think the syntax is enum {bar=5, foo, bugger ...).

Don't remember if (FEB > JAN) works, but ((int)FEB > (int)JAN)
definitely works.
-- 
Name:			Christopher J. Calabrese
Brain loaned to:	AT&T Bell Laboratories, Murray Hill, NJ
att!ulysses!cjc		cjc@ulysses.att.com
Obligatory Quote:	``Anyone who would tell you that would also try and sell you the Brooklyn Bridge.''