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| From | Shao Miller <sha0.miller@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: a doubt about c |
| Date | 2011-06-11 11:23 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <it019r$9rg$1@dont-email.me> (permalink) |
| References | <7523b6ca-ef28-41c3-99d8-c60273641ddf@glegroupsg2000goo.googlegroups.com> |
On 6/11/2011 8:11 AM, Ya Shou wrote:
>...
> I read some open source c program code, found a problem that let me doubt.
> All those programs are using macros to define constants, and did not use an enum to achieve, but I think in the enumeration constants is very convenient.
> Enumeration defines constants used in c++, but not seen any in c, why?
> ...
If you mean "integer constant expressions," I prefer to use 'enum's in C
wherever possible.
If an integer constant expression needs to be used as part of an '#if'
pre-processing directive, then I will '#define' and use a macro whose
definition will not contain any identifiers (except other macros) or
keywords.
#define ALL_ONES_CHAR ((1 << CHAR_BIT) - 1)
enum cv {
cv_minute = 60,
cv_timeout = 2 * cv_minute,
cv_sector_size = 1 << 9,
cv_max_buf_size = 4 * cv_sector_size,
/* ... */
cv_zero = 0
};
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a doubt about c Ya Shou <zxyzxy12321@gmail.com> - 2011-06-11 06:11 -0700
Re: a doubt about c James Kuyper <jameskuyper@verizon.net> - 2011-06-11 09:36 -0400
Re: a doubt about c Angel <angel+news@spamcop.net> - 2011-06-11 14:37 +0000
Re: a doubt about c Keith Thompson <kst-u@mib.org> - 2011-06-11 11:55 -0700
Re: a doubt about c Angel <angel+news@spamcop.net> - 2011-06-11 20:41 +0000
Re: a doubt about c Ian Collins <ian-news@hotmail.com> - 2011-06-12 08:58 +1200
Re: a doubt about c Shao Miller <sha0.miller@gmail.com> - 2011-06-11 17:09 -0500
Re: a doubt about c Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-11 18:25 -0400
Re: a doubt about c Ian Collins <ian-news@hotmail.com> - 2011-06-12 11:43 +1200
Re: a doubt about c Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-06-12 05:38 -0700
Re: a doubt about c Roberto Waltman <usenet@rwaltman.com> - 2011-06-12 10:12 -0400
Re: a doubt about c Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-12 10:59 -0400
Re: a doubt about c Nobody <nobody@nowhere.com> - 2011-06-15 17:07 +0100
Re: a doubt about c Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-06-12 11:33 -0700
Re: a doubt about c James Kuyper <jameskuyper@verizon.net> - 2011-06-15 09:53 -0400
Re: a doubt about c Dr Nick <3-nospam@temporary-address.org.uk> - 2011-06-16 18:46 +0100
Re: a doubt about c DSF <notavalid@address.here> - 2011-06-11 18:53 -0500
Re: a doubt about c Keith Thompson <kst-u@mib.org> - 2011-06-11 16:18 -0700
Re: a doubt about c Stephen Sprunk <stephen@sprunk.org> - 2011-06-11 21:13 -0500
Re: a doubt about c Ian Collins <ian-news@hotmail.com> - 2011-06-12 14:56 +1200
Re: a doubt about c Keith Thompson <kst-u@mib.org> - 2011-06-11 20:24 -0700
Re: a doubt about c Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-12 08:10 -0400
Re: a doubt about c Ian Collins <ian-news@hotmail.com> - 2011-06-12 11:49 +1200
Re: a doubt about c Keith Thompson <kst-u@mib.org> - 2011-06-11 15:36 -0700
Re: a doubt about c Nobody <nobody@nowhere.com> - 2011-06-12 00:23 +0100
Re: a doubt about c Seebs <usenet-nospam@seebs.net> - 2011-06-13 14:39 +0000
Re: a doubt about c Squeamizh <squeamz@hotmail.com> - 2011-06-15 15:44 -0700
Re: a doubt about c Geoff <geoff@invalid.invalid> - 2011-06-15 19:57 -0700
Re: a doubt about c "J. J. Farrell" <jjf@bcs.org.uk> - 2011-06-16 18:39 +0100
Re: a doubt about c Nobody <nobody@nowhere.com> - 2011-06-17 15:39 +0100
Re: a doubt about c Willem <willem@toad.stack.nl> - 2011-06-17 14:49 +0000
Re: a doubt about c Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-17 09:14 -0600
Re: a doubt about c Shao Miller <sha0.miller@gmail.com> - 2011-06-17 12:00 -0500
Re: a doubt about c Shao Miller <sha0.miller@gmail.com> - 2011-06-17 11:08 -0500
Re: [OT] Doubt vs. question. (Re: a doubt about c) Shao Miller <sha0.miller@gmail.com> - 2011-06-17 13:00 -0500
Re: [OT] Doubt vs. question. (Re: a doubt about c) Shao Miller <sha0.miller@gmail.com> - 2011-06-22 19:01 -0500
Re: a doubt about c Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-17 09:14 -0600
Re: a doubt about c Seebs <usenet-nospam@seebs.net> - 2011-06-17 22:16 +0000
Re: a doubt about c "J. J. Farrell" <jjf@bcs.org.uk> - 2011-06-18 02:24 +0100
Re: a doubt about c Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-11 23:09 -0600
[OT] Doubt vs. question. (Re: a doubt about c) Roberto Waltman <usenet@rwaltman.com> - 2011-06-12 10:05 -0400
Re: [OT] Doubt vs. question. (Re: a doubt about c) Keith Thompson <kst-u@mib.org> - 2011-06-12 11:22 -0700
Re: [OT] Doubt vs. question. (Re: a doubt about c) Ben Pfaff <blp@cs.stanford.edu> - 2011-06-12 11:44 -0700
Re: [OT] Doubt vs. question. (Re: a doubt about c) Ralph Spitzner <rasp@spitzner.org> - 2011-06-13 11:31 +0200
Re: [OT] Doubt vs. question. (Re: a doubt about c) James Kuyper <jameskuyper@verizon.net> - 2011-06-15 10:03 -0400
Re: [OT] Doubt vs. question. (Re: a doubt about c) Dr Nick <3-nospam@temporary-address.org.uk> - 2011-06-17 07:52 +0100
Re: [OT] Doubt vs. question. (Re: a doubt about c) Michael Press <rubrum@pacbell.net> - 2011-06-19 00:41 -0700
Re: [OT] Doubt vs. question. (Re: a doubt about c) James Kuyper <jameskuyper@verizon.net> - 2011-06-19 07:04 -0400
Re: [OT] Doubt vs. question. (Re: a doubt about c) Bill Waddington <william.waddington@beezmo.com> - 2011-06-23 11:03 -0700
Re: a doubt about c Shao Miller <sha0.miller@gmail.com> - 2011-06-11 11:23 -0500
Re: a doubt about c pete <pfiland@mindspring.com> - 2011-06-11 13:56 -0400
Re: a doubt about c "dr.oktopus" <blindwilly@freeonline.zzn.com> - 2011-06-11 12:53 -0700
Re: a doubt about c Lew Pitcher <lpitcher@teksavvy.com> - 2011-06-11 16:01 -0400
Re: a doubt about c Keith Thompson <kst-u@mib.org> - 2011-06-11 13:07 -0700
Re: a doubt about c Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-11 14:13 -0600
Re: a doubt about c Nobody <nobody@nowhere.com> - 2011-06-11 23:31 +0100
Re: a doubt about c pete <pfiland@mindspring.com> - 2011-06-11 20:07 -0400
Re: a doubt about c Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-06-11 23:05 -0600
Re: a doubt about c Shao Miller <sha0.miller@gmail.com> - 2011-06-11 16:42 -0500
Re: a doubt about c "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-06-11 14:23 -0700
Re: a doubt about c Shao Miller <sha0.miller@gmail.com> - 2011-06-11 17:27 -0500
Re: a doubt about c Keith Thompson <kst-u@mib.org> - 2011-06-11 15:42 -0700
Re: a doubt about c Seebs <usenet-nospam@seebs.net> - 2011-06-13 14:39 +0000
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