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| From | Richard Heathfield <rjh@cpax.org.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: What is the value after operator '!'? |
| Date | 2015-10-26 14:04 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <n0lbpc$op5$1@dont-email.me> (permalink) |
| References | <7229ebda-7352-441e-9946-ccee1ce81b03@googlegroups.com> |
On 26/10/15 13:21, fl wrote: > Hi, > > I saw coding such as: a=!a before. Today, when I write my code below, I find > if on_off_flag==0, on_off_flag will be '1' after > > on_off_flag = !on_off_flag; > > It is a surprise to me. I supposed it will be 0xFFFF,FFFF for integer > on_off_flag > > '!' is an inverse operator or not? It's the logical inverse. !anynonzerovalue is 0, and !0 is 1, by definition. If you want bitwise inverse, use ~ and be careful. -- Richard Heathfield Email: rjh at cpax dot org dot uk "Usenet is a strange place" - dmr 29 July 1999 Sig line 4 vacant - apply within
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What is the value after operator '!'? fl <rxjwg98@gmail.com> - 2015-10-26 06:21 -0700
Re: What is the value after operator '!'? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-26 09:29 -0400
Re: What is the value after operator '!'? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-26 13:42 +0000
Re: What is the value after operator '!'? supercat@casperkitty.com - 2015-10-26 07:53 -0700
Re: What is the value after operator '!'? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-26 17:37 +0000
Re: What is the value after operator '!'? Keith Thompson <kst-u@mib.org> - 2015-10-26 11:05 -0700
Re: What is the value after operator '!'? supercat@casperkitty.com - 2015-10-26 11:38 -0700
Re: What is the value after operator '!'? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-10-26 20:27 +0000
Re: What is the value after operator '!'? supercat@casperkitty.com - 2015-10-26 14:16 -0700
Re: What is the value after operator '!'? Keith Thompson <kst-u@mib.org> - 2015-10-26 17:15 -0700
Re: What is the value after operator '!'? Keith Thompson <kst-u@mib.org> - 2015-10-26 17:12 -0700
Re: What is the value after operator '!'? Ian Collins <ian-news@hotmail.com> - 2015-10-27 10:27 +1300
Re: What is the value after operator '!'? Keith Thompson <kst-u@mib.org> - 2015-10-26 15:15 -0700
Re: What is the value after operator '!'? supercat@casperkitty.com - 2015-10-26 16:16 -0700
Re: What is the value after operator '!'? Keith Thompson <kst-u@mib.org> - 2015-10-27 08:39 -0700
Re: What is the value after operator '!'? Richard Heathfield <rjh@cpax.org.uk> - 2015-10-26 14:04 +0000
Re: What is the value after operator '!'? Geoff <geoff@invalid.invalid> - 2015-10-26 09:50 -0700
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