How to allocate memory for a multidimensional array dynamically?

Many times we need to allocate memory for a multidimensional array dynamically. Because of complexity of pointers many find this difficult.

Following program allocates memory for a 3 x 3 array dynamically, copies contents of a 3 x 3 array in it and prints the contents using the pointer.

#include <iostream.h>

#include <new.h>

int a[ ][3] = {

                      1, 2, 3,

                      4, 5, 6,

                      7, 8, 9

                  };

void main( )

{

     int **p;

     p = new int *[3] ;

     for ( int i = 0 ; i < 3 ; i++ )

            p[i] = new int[3];

     for ( i = 0 ; i < 3 ; i++ )

       for ( int j = 0 ; j < 3 ; j++ )

            p[i][j] = a[i][j] ; 

     for ( i = 0 ; i < 3 ; i++ )

     {

       for ( j = 0 ; j < 3 ; j++ )

            cout << p[i][j] ;

      cout << "\n" ;

     }

}