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| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: trying a linked list |
| Date | 2016-05-08 14:26 -0700 |
| Organization | None to speak of |
| Message-ID | <ln60uoxmug.fsf@kst-u.example.com> (permalink) |
| References | (4 earlier) <nglsub$lvf$1@dont-email.me> <500b3147-def9-4831-8fa2-e13fddc23666@googlegroups.com> <ngm0r6$vtm$1@dont-email.me> <lnzis1xn0v.fsf@kst-u.example.com> <ngo0s4$g9h$1@dont-email.me> |
"Bill Cunningham" <nospam@nspam.invalid> writes:
> "Keith Thompson" <kst-u@mib.org> wrote in message
> news:lnzis1xn0v.fsf@kst-u.example.com...
>
> [...]
>
>> Linked lists are normally allocated one node at a time, with each node
>> being allocated as it's needed.
>
> Yes I know that 's there purpose. My goal is to get past,
>
> 1
> segmentation fault; to
>
> 1
> 2
> 3
> 4
>
> And I'll be a success. I posted these int casts like you suggested and got
> these errors.
I did *not* suggest casting anything. I pointed out (incorrectly, as
it turns out) that casting to int would avoid the compile-time error,
but I specifically said that's not what you should do.
> p.c: In function 'main':
> p.c:15:5: error: aggregate value used where an integer was expected
> printf("%d\n", (int)*sp);
> ^
> p.c:18:5: error: aggregate value used where an integer was expected
> printf("%d\n", (int)*sp);
> ^
(That error message is poorly phrased. The operand of the (int) cast is
expected to be of scalar type; it needn't be an integer. But that
doesn't matter much.)
> I looked up trying to use malloc and they say never cast it's return. Here's
> the code thus far,
>
> #include <stdio.h>
> #include <stdlib.h>
>
> struct node {
> int number;
> struct node *next;
> };
>
> int main()
A very minor quibble: This is better written as "int main(void)".
> {
> struct node base;
> struct node *sp;
> sp = &base;
> sp->number = 1;
> printf("%d\n", *sp);
This is the same mistake you made before.
"%d" requires an argument of type int. What is the type of *sp?
What do you expect this printf call to do?
There is no point in going further until you have answers to the above
questions and an idea of how to fix the problem.
> sp = malloc(sizeof *sp);
> sp->next->number = 2;
sp->next is an uninitialized pointer.
[...]
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-07 17:06 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-07 17:32 -0400
Re: trying a linked list Rosario19 <Ros@invalid.invalid> - 2016-05-07 23:44 +0200
Re: trying a linked list "martin.ambuhl" <mambuhl@earthlink.net> - 2016-05-07 19:49 -0400
Re: trying a linked list Richard Heathfield <rjh@cpax.org.uk> - 2016-05-08 07:46 +0100
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-07 14:35 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-07 17:53 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-07 15:01 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-07 19:18 -0400
Re: trying a linked list Jerry Stuckle <jstucklex@attglobal.net> - 2016-05-07 19:28 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-07 16:40 -0700
Re: trying a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-05-07 17:15 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-07 20:25 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-07 20:10 -0700
Re: trying a linked list Richard Heathfield <rjh@cpax.org.uk> - 2016-05-08 07:53 +0100
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 14:19 -0700
Re: trying a linked list Manfred <mx2927@gmail.com> - 2016-05-08 18:45 +0200
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 17:21 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 14:38 -0400
Re: trying a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-08 20:08 +0100
Re: trying a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-08 20:26 +0100
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 17:22 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 15:28 -0400
Re: trying a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-08 20:36 +0100
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 17:17 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 14:56 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 18:17 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 19:31 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 14:59 -0400
Re: trying a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-08 23:22 +0100
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 14:46 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 14:32 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-08 18:05 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 14:26 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 13:50 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 14:08 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-09 11:38 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 14:50 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 14:51 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-09 13:51 -0700
Re: trying a linked list Ken Brody <kenbrody@spamcop.net> - 2016-05-09 17:53 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-09 13:47 -0700
Re: trying a linked list "Osmium" <r124c4u102@comcast.net> - 2016-05-09 15:58 -0500
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 17:13 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-09 14:35 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 17:40 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 17:41 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-09 15:10 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 22:02 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-09 21:17 -0700
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-09 22:31 -0400
Re: trying a linked list "Bill Cunningham" <nospam@nspam.invalid> - 2016-05-07 20:30 -0400
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-07 20:06 -0700
Re: trying a linked list Richard Heathfield <rjh@cpax.org.uk> - 2016-05-08 07:50 +0100
Re: trying a linked list BartC <bc@freeuk.com> - 2016-05-08 10:33 +0100
Re: trying a linked list Richard Heathfield <rjh@cpax.org.uk> - 2016-05-08 10:39 +0100
Re: trying a linked list BartC <bc@freeuk.com> - 2016-05-08 11:14 +0100
Re: trying a linked list Richard Heathfield <rjh@cpax.org.uk> - 2016-05-08 13:34 +0100
Re: trying a linked list BartC <bc@freeuk.com> - 2016-05-08 14:39 +0100
Re: trying a linked list Richard Heathfield <rjh@cpax.org.uk> - 2016-05-08 14:51 +0100
Re: trying a linked list Siri Cruise <chine.bleu@yahoo.com> - 2016-05-08 07:30 -0700
Re: trying a linked list Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-05-08 10:36 +0100
Re: trying a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-05-08 02:49 -0700
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 14:17 -0700
Re: trying a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-05-08 14:36 -0700
Re: trying a linked list Keith Thompson <kst-u@mib.org> - 2016-05-08 14:57 -0700
Re: trying a linked list Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-05-09 13:28 -0700
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