Problem with array of structures

[Ian Tuomi]

Could anyone please tell me what is wrong with this code? Compiler error
is: "parse error before '.' token" in lines 13-16. I tried searching the
internet but all the reference guides etc. say It's ok. Is it a problem
with the compiler? I am using the dev-c++ front-end for mingw.

/* start code */
#include <stdio.h>

typedef struct
{
int x;
int y;
int width;
int height;
}ObstacleBB;

ObstacleBB obstacles[1];

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

int main(void)
{
return 0;
}
/* end code */

[Christopher Benson-Manica]

Ian Tuomi <ia*@co.jyu.fi> spoke thus:

ObstacleBB obstacles[1]; obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

obstacles is a pointer to a struct (that's what you get when you declare an
array), so to access elements, you want to do obstacles[0]->x, etc.

--
Christopher Benson-Manica | Jumonji giri, for honour.
ataru(at)cyberspace.org |

[Ian Tuomi]

Christopher Benson-Manica wrote:

Ian Tuomi <ia*@co.jyu.fi> spoke thus:

ObstacleBB obstacles[1];

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

obstacles is a pointer to a struct (that's what you get when you declare an
array), so to access elements, you want to do obstacles[0]->x, etc.

Oh ofcourse! Thankyou so much!

[Ian Tuomi]

Ian Tuomi wrote:

Christopher Benson-Manica wrote:

Ian Tuomi <ia*@co.jyu.fi> spoke thus:

ObstacleBB obstacles[1];

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

obstacles is a pointer to a struct (that's what you get when you
declare an
array), so to access elements, you want to do obstacles[0]->x, etc.

Oh ofcourse! Thankyou so much!

Umh.. sorry I jumped into conclusions but now it says:
"parse error before '->' token" so looks like I either still have a
problem or mis-interperted youre message really badly.

[Mark A. Odell]

Ian Tuomi <ia*@co.jyu.fi> wrote in
news:bk**********@phys-news1.kolumbus.fi:

Could anyone please tell me what is wrong with this code? Compiler error
is: "parse error before '.' token" in lines 13-16. I tried searching the
internet but all the reference guides etc. say It's ok. Is it a problem
with the compiler? I am using the dev-c++ front-end for mingw.

/* start code */
#include <stdio.h>

typedef struct
{
int x;
int y;
int width;
int height;
}ObstacleBB;

ObstacleBB obstacles[1];

Put these *inside* a function! You can't have run-time code hanging out
like this.
obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

int main(void)
{
return 0;
}
/* end code */

--
- Mark ->
--

[Chapman]

"Ian Tuomi" <ia*@co.jyu.fi> wrote in message
news:bk**********@phys-news1.kolumbus.fi...

Could anyone please tell me what is wrong with this code? Compiler error
is: "parse error before '.' token" in lines 13-16. I tried searching the
internet but all the reference guides etc. say It's ok. Is it a problem
with the compiler? I am using the dev-c++ front-end for mingw.

/* start code */
#include <stdio.h>

typedef struct
{
int x;
int y;
int width;
int height;
}ObstacleBB;

ObstacleBB obstacles[1];

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

This is fine, according to your structure declarations, but you need to put

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

inside your main function.

<snip>

int main() {

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = 0; //(OFFSET_X * 2);
obstacles[0].height = 0; //(OFFSET_Y * 2);

return 0;
}
/* end code */

Hope it helps

int main(void)
{
return 0;
}
/* end code */

[Ian Tuomi]

Ok, Thanks everyone it works now. wow! 3 answers in half an hour. I am
impressed. Is this normal in comp.lang.c ?

[Christopher Benson-Manica]

Ian Tuomi <ia*@co.jyu.fi> spoke thus:

Umh.. sorry I jumped into conclusions but now it says:
"parse error before '->' token" so looks like I either still have a
problem or mis-interperted youre message really badly.

Nah, I probably blew it - listen to the other people ;)

--
Christopher Benson-Manica | Jumonji giri, for honour.
ataru(at)cyberspace.org |

[Ian Pilcher]

Ian Tuomi wrote:

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

As others have mentioned, you can put this code inside a function. An
alternative is to initialize your structure in its declaration.

ObstacleBB obstacles[1] =
{ /* braces around array */
{ 0, 0, OFFSET_X * 2, OFFSET_Y * 2 } /* braces around element */
};

This will only work if OFFSET_X and OFFSET_Y are #defined constants
(sloppy terminology, I know).

--
================================================== ======================
Ian Pilcher i.*******@comcast.net
================================================== ======================

[Irrwahn Grausewitz]

Ian Tuomi <ia*@co.jyu.fi> wrote:

Ok, Thanks everyone it works now. wow! 3 answers in half an hour. I am
impressed. Is this normal in comp.lang.c ?

Depends on how many people are reading and posting while pretending they
are doing their job. :-)
--
The generation of random numbers is too important to be left to chance.

[Alex]

Christopher Benson-Manica <at***@nospam.cyberspace.org> wrote:

Ian Tuomi <ia*@co.jyu.fi> spoke thus:

ObstacleBB obstacles[1]; obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

obstacles is a pointer to a struct (that's what you get when you declare an
array), so to access elements, you want to do obstacles[0]->x, etc.

Nonsense. Where do you see a pointer?

Alex

[Mark A. Odell]

Ian Tuomi <ia*@co.jyu.fi> wrote in
news:bk**********@phys-news1.kolumbus.fi:

Ok, Thanks everyone it works now. wow! 3 answers in half an hour. I am
impressed. Is this normal in comp.lang.c ?

It depends upon how long my builds are taking at the moment.

--
- Mark ->
--

[Peter Shaggy Haywood]

Groovy hepcat Christopher Benson-Manica was jivin' on Fri, 19 Sep 2003
16:49:07 +0000 (UTC) in comp.lang.c.
Re: Problem with array of structures's a cool scene! Dig it!

Ian Tuomi <ia*@co.jyu.fi> spoke thus:

ObstacleBB obstacles[1];

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

obstacles is a pointer to a struct (that's what you get when you declare an
array), so to access elements, you want to do obstacles[0]->x, etc.

Absolute piffle! obstacles is an ARRAY of struct. He is accessing
the first (and only) element of this array with [0], thus yeilding a
struct. He is then correctly accessing members of this struct with the
dot operator. The error is not how he's doing that, but where.
Please refrain from posting an answer when you don't know the
correct one.

[Deepak]

C language does not support such assignment of the global variabe.
What you can do is just move the initialization part inside main.
like
int main(void)
{
obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = 2;
obstacles[0].height = 2;
return 0;
}
or the second method can be
ObstacleBB obstacles[1] = {2,2,(OFFSET_X * 2),(OFFSET_Y * 2)};

DG
__________________________________________________ _
Ian Tuomi <ia*@co.jyu.fi> wrote in message news:<bk**********@phys-news1.kolumbus.fi>...

Could anyone please tell me what is wrong with this code? Compiler error
is: "parse error before '.' token" in lines 13-16. I tried searching the
internet but all the reference guides etc. say It's ok. Is it a problem
with the compiler? I am using the dev-c++ front-end for mingw.

/* start code */
#include <stdio.h>

typedef struct
{
int x;
int y;
int width;
int height;
}ObstacleBB;

ObstacleBB obstacles[1];

obstacles[0].x = 0;
obstacles[0].y = 0;
obstacles[0].width = (OFFSET_X * 2);
obstacles[0].height = (OFFSET_Y * 2);

int main(void)
{
return 0;
}
/* end code */