Suppose...
char *Area[50];
each Area[x] points to a NEW(from HEAP) char array
in the destructor....
I don't think delete *Area; wil destroy all 50 dynamic arrays ?
if (Area)
for(int i=0;Area[i];i++)
delete Area[i];
Gives an error, so does, delete *Area[i];
you can't delete it if you didn't create it with 'new' first off...
delete []Array
Blue
Assuming unallocated elements are NULL
for(int i=0;i<50;i++)
if(Area[i])
delete [] Area[i];
should work, if I've understood what you're trying to do.
Oh... sorry. I missed it. I see what you are saying...
Code:int main() { int i; char *the[10]; for (i=0; i<=9; ++i) the[i] = new char[10]; for (i=0; i<=9; ++i) delete []the[i]; return 0; }
Blue
When i allocate the NEW array, how is it possible to assign NULL to each NEW element in the newly created array ?
things like Area[i]+j=NULL in a for loop don't work, they look like they should though, I'm probably missing some * operators somewhere.
so you want every array element in each of the new character arrays to be null?
use a nested for loop...
draw a line straight down on a piece of lined paper. Imagine that line is an array of pointers and the lines going to the right are representative of a character array per line.Code:for (i=0;i<=9;++i) { for (j=0;j<=9;++j) { the[i][j]=NULL; } }
The character arrays are referenced normally, but through the use of a pointer. You cannot put a NULL at the position of the pointer, because it is a character array and not a character. So the character arrays themselves can have data put into them by
the[0][0] = 'a';
which represents the first pointer to the first block of the first array. It is like a grid... it is called a two dimensional array.
Make sense...?
Last edited by Betazep; 03-03-2002 at 07:19 PM.
Blue
Here is a graphical representation of the above mentioned that I made real quick. Perhaps it will help you...
Code:0 1 2 3 4 ----- ----- ----- ----- ----- ptr1->| 0,0 | 0,1 | 0,2 | 0,3 | 0,4 | ----- ----- ----- ----- ----- ptr2->| 1,0 | 1,1 | 1,2 | 1,3 | 1,4 | ----- ----- ----- ----- ----- ptr3->| 2,0 | 2,1 | 2,2 | 2,3 | 2,4 | ----- ----- ----- ----- ----- ptr4->| 3,0 | 3,1 | 3,2 | 3,3 | 3,4 | ----- ----- ----- ----- ----- ptr5->| 4,0 | 4,1 | 4,2 | 4,3 | 4,4 | ----- ----- ----- ----- -----
Blue
Most Excellent !
.......Much Appreciated !
You're most certainly welcome. I'm sure you will return the favor someday....
Blue
