Pointers to Multidimensional Arrays
Author
I''m having trouble assigning a pointer to a multidimensional array:
gameboard board[50][50];
gameboard **pboard;
basically I want to assign my pointer (pboard) to (board) so I can pass it into my function:
Initboard(gameboard **ptogameboard);
Thanks.
Few ways to do it.
Hope that helps
[edited by - Jingo on April 5, 2004 10:45:13 AM]
//by referencevoid fun(int (&p)[50][50]){}//by valuevoid fun(int p[50][50]){}//by value againvoid fun(int p[][50]){}//by pointervoid funbypointer(int (*p)[50][50]){}int p[50][50];fun(p);funbypointer(&p);Hope that helps
[edited by - Jingo on April 5, 2004 10:45:13 AM]
quote:Original post by ctt
I'm having trouble assigning a pointer to a multidimensional array:
gameboard board[50][50];
gameboard **pboard;
basically I want to assign my pointer (pboard) to (board) so I can pass it into my function:
Initboard(gameboard **ptogameboard);
First, your first declaration seems odd to me. Are you sure you want a 50x50 array of gameboards? That's 2,500 gameboards. Shouldn't you have a single gameboard, made of 50x50 pieces (squares, whatever).
Anyway, assuming I'm just unclear about that, think about what each variable is: board is a pointer to a 50x50 array, pboard is a pointer to a pointer (and thus should be called ppboard, or something). There are probably lots of ways to do what you want, but I would rewrite it like this:
gameboard *board[50]; // board is an array of 50 pointersgameboard **ppboard;for(int i=0;i<50;i++) // for each pointer board = new gameboard [50]; // create an array of 50 gameboards<br> </pre> <br><br>Now you can assign ppboard to board, and pass it around, etc. Just be sure to delete your mem as follows:<br><br><pre><br>for(int i=0;i<50;i++)<br> delete [] board;<br> </pre> <br> <br> <br><br><SPAN CLASS=editedby>[edited by - BriTeg on April 5, 2004 11:03:51 AM]</SPAN>
Author
yeah I realized I made a mistake in variable naming.. it really should be a 50x50 array of gameTILES. But, anyways, thanks for all the help and I think this did the trick:
gametile board[50][50];
gametile (*pboard)[50][50];
and my function as:
//by pointer
void funbypointer(gametile (*pboard)[50][50]){}
I don''t think that I needed that double pointer.
gametile board[50][50];
gametile (*pboard)[50][50];
and my function as:
//by pointer
void funbypointer(gametile (*pboard)[50][50]){}
I don''t think that I needed that double pointer.
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