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Groups > comp.lang.c++ > #85695
| From | Bo Persson <bo@bo-persson.se> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Differences between C and C++ |
| Date | 2022-07-27 19:28 +0200 |
| Message-ID | <jkdaufFuffU1@mid.individual.net> (permalink) |
| References | <tbm4vp$obp$1@gioia.aioe.org> <b406eff3-fcba-455b-af1a-4b422f2c088en@googlegroups.com> |
On 2022-07-27 at 19:09, Paul N wrote: > On Monday, July 25, 2022 at 2:14:50 PM UTC+1, Juha Nieminen wrote: >> Some people often object if someone conflates C and C++, as if C++ were >> just a pure superset of C, pointing out that they are, in fact, different >> languages and, in some aspects, actually incompatible with each other. >> >> That got me thinking: What are all the differences between the two >> languages, in behavior and meaning, when it comes to their common syntax? >> In other words, I'm not here talking about different keywords and different >> syntax that compiles in one but not the other. I'm talking about code that >> does compile as both C and C++, but will be interpreted or behave >> differently depending on which (and this makes them incompatible). > > As I understand it, the two languages have quite different philosophies. In BCPL there is a stated aim of eliminating hidden overhead. There seems nothing in the history of C to suggest that this aim was dropped, certainly B was developed on a very spartan machine. In contrast the aim in C++ is to try to hide the underlying details. Yes, we call that abstraction. :-) Bjarne uses an onion as his metafor. We don't want to see all the way to the core all the time. > > For example, in C, a = b + c is a straight-forward addition, though depending on the types it might be a floating-point addition or it might involve a hidden multiplication by a pointer size. In C++, a = b + c could be anything - for instance, it might concatenate two files to form a third one, involving thousands of disk accesses. I have never understood why this is a problem. In C you can write a = add(b, c) and it can do anything. How is that easier to see through than using the + operator?
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Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-25 13:14 +0000
Re: Differences between C and C++ "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-07-25 16:18 +0200
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-25 18:47 +0300
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-25 19:49 +0300
Re: Differences between C and C++ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-07-25 19:38 +0100
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-25 08:51 -0700
Re: Differences between C and C++ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-07-25 17:14 +0100
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-25 16:19 +0000
Re: Differences between C and C++ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-07-25 19:28 +0100
Re: Differences between C and C++ Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-07-25 12:21 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-26 07:54 +0000
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-26 08:00 +0000
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-26 08:09 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-26 02:42 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-26 15:29 +0000
Re: Differences between C and C++ scott@slp53.sl.home (Scott Lurndal) - 2022-07-26 16:30 +0000
Re: Differences between C and C++ Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-07-26 11:59 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-27 07:52 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-27 01:56 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-27 14:51 +0000
Re: Differences between C and C++ Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-07-27 11:11 -0700
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-26 06:09 +0000
Re: Differences between C and C++ Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-07-27 17:33 +0100
Re: Differences between C and C++ Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2022-07-25 17:45 +0100
Re: Differences between C and C++ Paul N <gw7rib@aol.com> - 2022-07-27 10:09 -0700
Re: Differences between C and C++ Bo Persson <bo@bo-persson.se> - 2022-07-27 19:28 +0200
Re: Differences between C and C++ Paul N <gw7rib@aol.com> - 2022-07-27 11:43 -0700
Re: Differences between C and C++ David Brown <david.brown@hesbynett.no> - 2022-07-29 18:04 +0200
Re: Differences between C and C++ Richard Damon <Richard@Damon-Family.org> - 2022-07-29 18:47 -0400
Re: Differences between C and C++ David Brown <david.brown@hesbynett.no> - 2022-07-30 14:08 +0200
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-28 08:03 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-28 01:57 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-28 09:04 +0000
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-28 06:53 +0000
Re: Differences between C and C++ Richard Damon <Richard@Damon-Family.org> - 2022-07-28 07:33 -0400
Re: Differences between C and C++ Bo Persson <bo@bo-persson.se> - 2022-07-28 15:04 +0200
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-28 15:11 +0000
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-28 20:03 +0300
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-29 07:56 +0000
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-29 12:03 +0300
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-29 09:28 +0000
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-29 12:27 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-29 05:43 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-29 14:14 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-29 08:25 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-29 15:48 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-29 13:12 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-30 09:28 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-30 03:39 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-30 14:23 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-30 19:07 -0700
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-31 07:22 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-31 06:07 -0700
Re: Differences between C and C++ muttley@dastardlyhq.com - 2022-07-31 16:36 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-08-01 01:12 -0700
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-29 22:47 +0000
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-30 03:48 -0700
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-07-29 05:16 -0700
Re: Differences between C and C++ Manfred <noname@add.invalid> - 2022-07-30 02:14 +0200
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-07-31 14:39 +0000
Re: Differences between C and C++ "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2022-07-31 18:49 +0200
Re: Differences between C and C++ Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-07-31 14:49 -0700
Re: Differences between C and C++ Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-07-31 17:03 -0700
Re: Differences between C and C++ Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-08-01 00:16 -0700
Re: Differences between C and C++ Ike Naar <ike@sdf.org> - 2022-08-01 07:27 +0000
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-01 10:47 +0300
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-01 10:34 +0300
Re: Differences between C and C++ Manfred <noname@add.invalid> - 2022-08-03 01:20 +0200
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-08-03 07:59 +0000
Re: Differences between C and C++ Bo Persson <bo@bo-persson.se> - 2022-08-03 12:45 +0200
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-08-03 10:53 +0000
Re: Differences between C and C++ Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-08-03 03:58 -0700
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-03 14:49 +0300
Re: Differences between C and C++ Öö Tiib <ootiib@hot.ee> - 2022-08-03 23:31 -0700
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-08-01 11:29 +0000
Re: Differences between C and C++ Bo Persson <bo@bo-persson.se> - 2022-08-01 14:39 +0200
Re: Differences between C and C++ Juha Nieminen <nospam@thanks.invalid> - 2022-08-02 05:43 +0000
Re: Differences between C and C++ Manfred <noname@add.invalid> - 2022-08-03 01:13 +0200
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-03 09:34 +0300
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-29 09:22 +0000
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-29 13:53 +0300
Re: Differences between C and C++ Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-29 14:13 +0300
Re: Differences between C and C++ Muttley@dastardlyhq.com - 2022-07-29 14:11 +0000
Re: Differences between C and C++ Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2022-07-28 06:16 -0700
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