/*  Example taken from   http://www.ihypress.net/programming/c/prog.php?chap=09&pgm=06
Dynamic allocation of a 2D array */
/* (Computer Scientist's Method) */

#include <stdio.h>
#include <stdlib.h>

/* Dynamic allocation of arrays of more than one dimension can also be done 
using a pointer pointing to an array of pointers and each pointer of that array 
pointing to an array of values. With that method you can use the real 2-D 
subscripts like array[i][j] */

int
main (void)
{
	int nrows, ncols, i, j;
	int **numbers; /* pointer to the first cell ([0][0]) */
	
	printf ("How many rows and columns?> ");
	scanf ("%d%d", &nrows, &ncols);

	/* allocating the array of pointers */
	numbers = (int **) calloc (nrows, sizeof(int *));

	/* allocating the array of integers */
	for (i=0; i<nrows; ++i)
		numbers[i] = (int *) calloc (ncols, sizeof(int));

	i=1; j=1;
	numbers[i][j] = 9; /* initializes one value to 9 */
	
	
	for (i=0; i<nrows; i=i+1)
	{	
		for (j=0; j<ncols; j=j+1)
		{
			printf ("%3d ", numbers[i][j]);
			
		}
		printf ("\n");
	}

	/* freeing the array */
	for (i=0; i<nrows; ++i)
		free (numbers[i]);

	free (numbers);

	return (0);
}