From:	Carl Hover <buzz AT off DOT spambots>
Newsgroups:	comp.os.msdos.djgpp
Subject:	enum - Why does true == false?
Message-ID:	<HbrhNzeq9qsy9UvyzT4fDeX4Lrnh@4ax.com>
X-Newsreader:	Forte Agent 1.6/32.525
X-No-Archive:	yes
MIME-Version:	1.0
Lines:	22
NNTP-Posting-Date:	Thu, 16 Sep 1999 22:49:32 CDT
Organization:	Giganews.Com - Premium News Outsourcing
X-Trace:	sv1-2ITIzBF4nJrzAMt5vDtlkz9A31ujuyVI621I1y2r4KgnNx1weca/eIDBAvADBuQMNnsQMVDKemeyL1T!VyOH5A==
X-Complaints-To:	abuse AT GigaNews DOT Com
X-Abuse-Info:	Please be sure to forward a copy of ALL headers
X-Abuse-Info:	Otherwise we will be unable to process your complaint properly
Date:	Thu, 16 Sep 1999 20:49:32 -0700
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Why does this program print "true == false" when compiled with djgpp
v2.01, and "true != false" when compiled with Borland C++ 3.1? Are
enum constants ill-defined during preprocessing?


#include <stdio.h>

int main(void)
{
  enum {false, true};

  #if true == false
    printf("true == false\n");
  #endif

  #if true != false
    printf("true != false\n");
  #endif

  return 0;
}

- Raw text -