Santosh,
Why not use calloc() instead of malloc()?
John
On 03/28/2011 07:08 PM, Santosh Navale wrote:
Hi Florian,
Thanks for the suggestion. As far as I know, this one of the ways of
declaring a 2D matrix in C. Please correct me if I am wrong. The
initialization happens in another nested for loop.
Thanks
Santosh
On Mon, Mar 28, 2011 at 9:07 PM, Florian Krohm <brit...@acm.org
<mailto:brit...@acm.org>> wrote:
On 03/28/2011 09:26 PM, Santosh Navale wrote:
> Hi,
>
> The following is the message I get when I run valgrind on my C code.
>
> ==16455== Use of uninitialised value of size 8
> ==16455== at 0x4E6A76B: _itoa_word (_itoa.c:195)
> ==16455== by 0x4E6B9B8: vfprintf (vfprintf.c:1613)
> ==16455== by 0x4E75869: printf (printf.c:35)
> ==16455== by 0x400830: main (matrix1.c:42)
> ==16455== Uninitialised value was created by a heap allocation
> ==16455== at 0x4C244E8: malloc (vg_replace_malloc.c:236)
> ==16455== by 0x400752: main (matrix1.c:28)
>
>>From my understanding something on line 28 in the file matrix1.c
is causing
> an error. When I look at the source code,
>
> matrix = (int **) malloc (size * sizeof(int *));
> for (row = 0; row < size; row++) {
> matrix[row] = (int *) malloc (size * sizeof(int));
> <------------------- Line 28
> }
>
> I do not see how this can be a problem. Am I missing something very
> fundamental?
>
You might. Line 28 allocates memory but it does not initialize it.
matrix[row[ is initialized, of course, but matrix[row][0] etc.. is
not.
Florian
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