Message-ID: <35B0ADBC.389CD3CE@ipass.net>
From: Terry <iceman AT ipass DOT net>
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Newsgroups: comp.os.msdos.djgpp
Subject: Re: big matrix/array
References: <35D0C6B0BF1 AT cyberlib DOT itb DOT ac DOT id.> <35AAEC96 DOT 2893C89E AT cartsys DOT com> <35b0151a DOT 9633555 AT news DOT rmi DOT net> <6opo4m$8nv AT news-central DOT tiac DOT net>
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Date: Sat, 18 Jul 1998 14:20:05 GMT
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Martin Ambuhl wrote:
> 
> John Meyer wrote in message <35b0151a DOT 9633555 AT news DOT rmi DOT net>...
> |On Mon, 13 Jul 1998 22:28:54 -0700, Nate Eldredge <nate AT cartsys DOT com>
> |wrote:
> |
> |>int a[3000][3000];
> |
> |
> |Okay, but how do you make an array dynamic?
> ===========
> #include <stdlib.h>
> int main(void)
> {
>     int *a;
>     if (!(a = malloc(9000000))) exit(EXIT_FAILURE);
>     /* do stuff */
>     free(a);
>     return 0;
> }
> 
> Martin Ambuhl (mambuhl AT tiac DOT net)
> /* Newsgroup posts also e-mailed */

An alternative would be:

#include <stdlib.h>
int main(void)
{
    int **a;
    int i;
    a = (int **) malloc(3000*sizeof(int));
    for(i=0;i<3000;i++)
       a[i] = (int *) malloc(3000*sizeof(int);
....

   /* to free memory */
   for(i=0;i<3000;i++)
      free(a[i]);
   free(a);
}