From 4073605707708736017 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,53d56717e82ab663 X-Google-Attributes: gidf78e5,public From: Anders Pytte Subject: Re: cout << null pointers Date: 2000/07/09 Message-ID: #1/1 X-Deja-AN: 644039001 Content-transfer-encoding: 7bit Approved: Fergus Henderson , moderator of comp.std.c++ References: <39656D42.E049FCAA@ix.netcom.com> X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f Content-Type: text/plain; charset="US-ASCII" X-Complaints-To: abuse@demon.net X-Mail2News-Path: news.demon.net!mulga.cs.mu.oz.au X-Trace: mail2news.demon.co.uk 963088257 mail2news:16957 mail2news mail2news.demon.co.uk X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) User-Agent: Microsoft-Outlook-Express-Macintosh-Edition/5.02.2022 Mime-version: 1.0 NNTP-Posting-Date: Fri, 07 Jul 2000 17:11:55 EDT Newsgroups: comp.std.c++ in article B58BAAC8.6E61%anders@milkweed.com, Anders Pytte at anders@milkweed.com wrote on 7/8/00 7:49 AM: > in article 39656D42.E049FCAA@ix.netcom.com, Paul Meyerholtz at > pholtz@ix.netcom.com wrote on 7/8/00 5:08 AM: > >> I have found an inconsistent output by various compilers of the following: >> >> char * p = 0; >> cout * q = ""; >> >> cout << p << "\n\n"; >> cout << q; >> [snip] > In the above, "cout << p" says, print the c string stored at address 0, > while "cout << q" says, print a c string of zero length. Why should these > produce the same output? This was a bit sloppy of me considering the heated discussion of NULL next door. It would be more correct to say simply that dereference of a NULL pointer is undefined, although on a typical implementation it amounts to accessing data stored at location 0. This is probably what happened when Paul used Metrowerks C++ on the Mac. Anders. -- Anders Pytte Milkweed Software PO Box 32 voice: (802) 586-2545 Craftsbury, VT 05826 email: anders@milkweed.com --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html ]