Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Two options of a program to find a track in the list |
| Date | 2015-10-23 10:52 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <877fmdq5d1.fsf@bsb.me.uk> (permalink) |
| References | <8855e43f-e1f3-47b8-9b45-989687dd97e7@googlegroups.com> <n0bamj$9g0$1@dont-email.me> <46021cd2-aee9-41f6-8038-65bbb362f502@googlegroups.com> <e42c0741-b2e0-4495-8ea8-7e3d0c0f0524@googlegroups.com> |
Alla _ <modelling.data@gmail.com> writes:
> On Friday, October 23, 2015 at 12:16:39 PM UTC+4, Alla _ wrote:
<snip>
>> char search[80];
>>
>> printf ("Enter your track name: ");
>> fgets (search, 80, stdin);
>>
>> find_track (search [i-1]);
<snip>
> I have just tried to use the
> find_track (search [i-1]);
>
> And have the following messages.
> When I compile the program, I get a warning:
>
> strstrpage85A.c: In function 'main':
> strstrpage85A.c:28: warning: passing argument 1 of 'find_track' makes
> pointer from integer without a cast
>
> If I understand it correctly (if it is what is written), then
> [i-1] turns search[i-1] to a pointer. Why and how?
'search' is an array name. In most situations it will be converted into
a pointer -- in this case a pointer to char. search[i-1] indexes that
pointer to get a specific char. C considers char to be an integer type
(characters are just small-valued integers) so the message is telling
you you passed something integer-like (a char) where something
pointer-like (a char *) was expected.
> Then, I get a segmentation error:
>
> Allas-MacBook-Pro:headfirst Alla$ ./strstrpage85A
> Enter your track name: Dancing with a Dork
> Segmentation fault: 11
That's good. It means the program tried to access some part of the
memory that it does not have permission to access. That often happens
when you take a small integer and force the machine to think of it as an
address (i.e. as a pointer). You are not always fortunate enough to get
a segmentation fault -- sometimes the integer looks like a proper
address, and the program carries on, creating chaos by fiddling with
parts of the memory you never intended it to access. Those errors (and
you will make many -- we all do) are very much harder to track down.
--
Ben.
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-22 11:30 -0700
Re: Two options of a program to find a track in the list Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-22 14:44 -0400
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 01:16 -0700
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 01:22 -0700
Re: Two options of a program to find a track in the list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-23 10:52 +0100
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 09:57 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 02:35 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 10:59 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 03:42 -0700
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 03:47 -0700
Re: Two options of a program to find a track in the list Barry Schwarz <schwarzb@dqel.com> - 2015-10-23 11:02 -0700
Re: Two options of a program to find a track in the list Geoff <geoff@invalid.invalid> - 2015-10-23 11:24 -0700
Re: Two options of a program to find a track in the list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-23 10:39 +0100
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 11:03 +0100
Re: Two options of a program to find a track in the list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-23 11:21 +0100
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 11:36 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 02:42 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 11:10 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 03:24 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 11:45 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 09:00 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 17:16 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 09:47 -0700
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 13:19 +0100
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 15:38 +0100
Re: Two options of a program to find a track in the list Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-23 10:57 -0400
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 15:59 +0100
Re: Two options of a program to find a track in the list David Brown <david.brown@hesbynett.no> - 2015-10-23 17:25 +0200
Re: Two options of a program to find a track in the list Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-23 11:55 -0400
Re: Two options of a program to find a track in the list Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-10-23 10:45 -0600
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 16:55 +0100
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 17:21 +0100
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 17:23 +0100
Re: Two options of a program to find a track in the list Keith Thompson <kst-u@mib.org> - 2015-10-23 12:58 -0700
Re: Two options of a program to find a track in the list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-23 02:19 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 10:28 +0100
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 11:12 +0100
Re: Two options of a program to find a track in the list Keith Thompson <kst-u@mib.org> - 2015-10-23 13:42 -0700
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 22:14 +0100
Re: Two options of a program to find a track in the list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-23 22:28 +0100
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 22:47 +0100
Re: Two options of a program to find a track in the list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-23 23:21 +0100
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-24 01:37 +0100
Re: Two options of a program to find a track in the list Keith Thompson <kst-u@mib.org> - 2015-10-23 14:52 -0700
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-23 23:06 +0100
Re: Two options of a program to find a track in the list Keith Thompson <kst-u@mib.org> - 2015-10-23 16:39 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-24 21:26 +0100
Re: Two options of a program to find a track in the list Bartc <bc@freeuk.com> - 2015-10-24 22:28 +0100
Re: Two options of a program to find a track in the list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-24 15:26 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-24 23:44 +0100
Re: Two options of a program to find a track in the list Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-23 09:03 -0400
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 09:10 -0700
Re: Two options of a program to find a track in the list Geoff <geoff@invalid.invalid> - 2015-10-23 11:21 -0700
Re: Two options of a program to find a track in the list Barry Schwarz <schwarzb@dqel.com> - 2015-10-22 14:50 -0700
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 01:25 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 10:00 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 01:36 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 10:04 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 03:58 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 12:07 +0100
Re: Two options of a program to find a track in the list Alla _ <modelling.data@gmail.com> - 2015-10-23 09:28 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-23 18:04 +0100
Re: Two options of a program to find a track in the list Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-23 13:31 -0400
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-24 21:21 +0100
Re: Two options of a program to find a track in the list Keith Thompson <kst-u@mib.org> - 2015-10-23 13:45 -0700
Re: Two options of a program to find a track in the list Ian Collins <ian-news@hotmail.com> - 2015-10-24 10:32 +1300
Re: Two options of a program to find a track in the list Keith Thompson <kst-u@mib.org> - 2015-10-23 15:33 -0700
Re: Two options of a program to find a track in the list Richard Heathfield <rjh@cpax.org.uk> - 2015-10-24 21:24 +0100
csiph-web