malloc

[Joseph]

I am trying to create a function that allocates memory for the matrix
through a function; like the code below. However, this does not seem to
work since I believe that the scope of the memory allocation only lasts
within the create function. Is there anyway around this? Thanx in
advance. I also DON'T want to declare int **matrix globally.
int main(void)
{
int **matrix;
create(matrix);
}

void create(int **matrix)
{ /*allocating mem for 2 by 3 int matrix*/
matrix = (int **)malloc(2*siz eof(int *));
matrix[0] = (int *)malloc(3*size of(int));
matrix[1] = (int *)malloc(3*size of(int));
}

[cody]

try that (not tested):

int main(void)
{
int **matrix;
create(matrix);
}

void create(int ***matrix)
{ /*allocating mem for 2 by 3 int matrix*/
*matrix = (int **)malloc(2*siz eof(int *));
(*matrix)[0] = (int*)malloc(3* sizeof(int));
(*matrix)[1] = (int*)malloc(3* sizeof(int));
}

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk

[NumLockOff]

"cody" <do************ *********@gmx.d e> wrote in message
news:bm******** ****@ID-176797.news.uni-berlin.de...

try that (not tested):

int main(void)
{
int **matrix;
create(matrix);
create (&matrix);

sounds better..
}

void create(int ***matrix)
{ /*allocating mem for 2 by 3 int matrix*/
*matrix = (int **)malloc(2*siz eof(int *));
(*matrix)[0] = (int*)malloc(3* sizeof(int));
(*matrix)[1] = (int*)malloc(3* sizeof(int));
}

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk

[Dan Pop]

In <bm************ @ID-176797.news.uni-berlin.de> "cody" <do************ *********@gmx.d e> writes:

try that (not tested):

int main(void)
{
int **matrix;
create(matrix);
Undefined behaviour: you're implicitly declaring create() as function
returning int. You're also passing create() an uninitialised pointer of
the wrong type.
}

void create(int ***matrix)
{ /*allocating mem for 2 by 3 int matrix*/
*matrix = (int **)malloc(2*siz eof(int *));
Undefined behaviour: you're implicitly declaring malloc as a function
returning int. Due to the bogus cast, the compiler is not even required
to diagnose the bug.
(*matrix)[0] = (int*)malloc(3* sizeof(int));
(*matrix)[1] = (int*)malloc(3* sizeof(int));
}

Could you, please, consider learning C *before* continuing to post in this
newsgroup?

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de

[cody]

> Could you, please, consider learning C *before* continuing to post in this

newsgroup?

ok iam so sorry, as i said my code was untested. at least i tried to help.

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk

[Dan Pop]

In <bm************ @ID-176797.news.uni-berlin.de> "cody" <do************ *********@gmx.d e> writes:

Could you, please, consider learning C *before* continuing to post in this
newsgroup?

ok iam so sorry, as i said my code was untested. at least i tried to help.

I can't see how such a thoroughly broken piece of code could help anyone.
First, learn C yourself and *only* then try to help other people. Tested
or not, your code clearly demonstrates your incompetence on C programming
issues.

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de