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Re: "warning: assignment from incompatible pointer type [enabled by default]"

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galois271@gmail.com wrote:

> Any help here would be GREATLY appreciated!  Thanks!!!
> 
> Here is my compiler response:
> 
> "gcc "./Desktop/C Programs/HeadFirstTests.c" -o "./Desktop/C Programs/HFT"
> && "./Desktop/C Programs/HFT" ./Desktop/C Programs/HeadFirstTests.c: In
> function ‘addFirst’: ./Desktop/C Programs/HeadFirstTests.c:40:16: warning:
> assignment from incompatible pointer type [enabled by default] ./Desktop/C
> Programs/HeadFirstTests.c: In function ‘printList’: ./Desktop/C
> Programs/HeadFirstTests.c:51:7: warning: assignment from incompatible
> pointer type [enabled by default] "
> 
> 
> /* This program builds
>    a basic linked list.
>    gcc "./Desktop/C Programs/HeadFirstTests.c" -o "./Desktop/C
>    Programs/HFT" && "./Desktop/C Programs/HFT"
> */
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> 
> typedef struct {           // Define a linked list node
>      char *name;
>      struct LLNODE *next;
> }LLNODE;

You are attempting to declare next with a yet undefined type. You must first 
make declare the struct.

/* Declaration of struct. */
struct LLNODE;

/* Declaration of typedef. */
typedef struct LLNODE LLNODE;

/* Definition of struct. */
struct LLNODE {
   char *name;
   struct LLNODE *next;
};

As a bonus tip, use of all upper case for names of structs is poor style. 
These should be reserved for macros.

-- 
JP
-- 
comp.lang.c.moderated - moderation address: clcm@plethora.net -- you must
have an appropriate newsgroups line in your header for your mail to be seen,
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Thread

"warning: assignment from incompatible pointer type [enabled by default]" galois271@gmail.com - 2013-01-04 18:14 -0600
  Re: "warning: assignment from incompatible pointer type [enabled by default]" "LeJacq, Jean Pierre" <jeanpierre.lejacq@quoininc.com> - 2013-02-26 10:48 -0600
  Re: "warning: assignment from incompatible pointer type [enabled by default]" espie@lain.home (Marc Espie) - 2013-02-26 10:51 -0600
  Re: "warning: assignment from incompatible pointer type [enabled by default]" Barry Schwarz <schwarzb@dqel.com> - 2013-02-26 10:47 -0600
  Re: "warning: assignment from incompatible pointer type [enabled by default]" Jasen Betts <jasen@xnet.co.nz> - 2013-02-26 10:51 -0600
  Re: "warning: assignment from incompatible pointer type [enabled by default]" Andrei Voropaev <avorop@mail.ru> - 2013-02-26 10:51 -0600
  Re: "warning: assignment from incompatible pointer type [enabled by default]" gordonb.zh6m9@burditt.org (Gordon Burditt) - 2013-02-26 10:51 -0600

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