Thread: pointers and arrays issue

Okay, Im writing a program where I need a 2d array that I don't know the length and width of at compiletime. I know the length and width will be the same, I just dont know what they are. Pointers only seem to work for making a 1d array. So if someone can help point me in the right direction!?

(In case you were wondering, im writing a magic square program)

Thanks!

I found the following code:

Code:

int **ptr;
	ptr=new int *[y];//creates an array pointer
	for(int i=0; i<y; i++)
	{
		p[i]=new int [x];//creates space for each row
	}

however i dont know how to navigate through that, or what/when to declare p.

you can replace p with ptr, and you can access it like a static 2d array

Code:

ptr[row][col];

Thanks but I figured it out on my own :-)

>> Im writing a program where I need a 2d array that I don't know the length and width of at compiletime.

In C++ you should use a vector of vectors for this.