Thread: Dynamic, multi-dimensional pointers!

Hi!

I think I'm beginning to figure these pointy things out:

Code:

int loop;
int x = 5;
int y = 2;

// create first subscript
long **group_total;
group_total = malloc (x * sizeof (long));

if (!group_total)
{
   printf ("\n\nError!  Not enough memory!\n\n");
}

//create second subscript
for (loop = 0; loop < x; loop++)
{
   group_total[loop] = malloc (y * sizeof (long));

   if (!group_total[loop])
   {
      printf ("\n\nError!  Not enough memory!\n\n");
   }
}

//free pointer
for (loop = 0; loop < x; loop++)
{
    free (group_total[loop]);
}

I was just wondering:

1) Is this correct? It compiles and seems to run correctly, but there's no certainty there...

2) Is this everything? ie: Do I need to free the first subscript also?