MESSAGE
| DATE | 2008-08-29 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] Re: multi-dim arrays in c
|
On Fri, Aug 29, 2008 at 05:43:40PM -0400, Stephen Adler wrote:
> Guys,
>
> I've got a standard c coding question which has been nagging me for a
> while and I was wondering what you guys may think or have the correct
> solution to this problem....
>
> Lets say I have a 2 dim array of data and the dimension sizes can change
> depending on the specific data set. I can read in the x and y dimensions
> from a file, then read in the x*y elements of the data a populate a
> memory area x*y*elementsizeinbytes with the data. But now I want to
> access the data. Without doing pointer arithmatic, is it possible to use
> the standard [][] notation somehow?
>
> for example
>
> int *data;
> x=getXDim();
> y=getYDim();
> data=(int *)malloc(x*y*sizeof(int));
> readInData(x,y,data);
> printf("Middle data element is %d\n",data[y][x]);
>
> but I know that that data[y][x] will barf on the compiler because the
> compiler has no way of knowing what the y size of the "y" dimension is...
>
> Any suggestions on how to use the N-dimensional bracket notation in this
> situation?
>
> Thanks.
>
Yes, in fact int main() does this using char** as a parameter.
I have a sample worked out on my laptop which I can't put on my
jobs network, but when I get home I'll post an example.
Ruben
>
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