Re: c++: 2D array

[Sojan James <sojan@xxxxxxxxxxxxxxxx>]

HI,
	Here is another way I figured out. The advantage of using this is
that the entire array can be copied with a single memcpy()

here is the code which explains all

<snip>
#include<iostream>

int main()
{
        // create the pointers to rows
        int ** ptr = new int*[4];

        // let the first row point to the entire data
        ptr[0] = new int[5 * 4];

        // let each subsequent row index into the
        // allocated data
        for(int i = 1; i < 4; i++)
        {
                ptr[i] = ptr[i-1] + 5 ;
        }

        ptr[0][1] = 10;
        ptr[3][4] = 10;

        cout << ptr[0][0] << endl ;
        cout << ptr[0][1] << endl ;
        cout << ptr[3][4] << endl ;
}


even though you can index into the array using ptr[i][j], the entire data
is pointed to by ptr[0], so copying the array will be much easier.

Cheers,

Soj.


-- 
Sojan James
National Semi. India Designs Ltd.
7/6 Brunton Road, Bangalore 560025. India.
Ph: 5587918/919/920 ext. 308