#include <stdio.h>

#define DIM1 2
#define DIM2 4

/******
 * Author:  G Towell
 * Created: August 2019
 * Modified: Sep 18. 2019
 *
 * Desc:
 *   A little program to show row major array assignment and use pointer math to really 
 *   confirm that the memory is in row major order 
 ******/
int main()
{
    int arr[DIM1][DIM2] = {0,1,2,3,100,101,102,103};
    /**
     * This does exactly what the {} does dor initializing the array
    for (int i=0; i<DIM1; i++)
        for (int j=0; j<DIM2; j++)
        {
            a[i][j] = 100*i+j;
        }

     */
    for (int i=0; i<DIM1; i++)
	for (int j=0; j<DIM2; j++)
	{
	    printf("d1:%d d2:%d %d\n", i, j, arr[i][j]);
	}

    //Print the array using pointers
    int *arrp = *(arr);
    for (int i=0; i< (DIM1*DIM2); i++)
    {
	printf("i:%d  %d\n", i, *(arrp++));
    }

    int *arrp2=*(arr)+2;  //move two steps down in the array -- (because I can!!!) but beware this is not the same as *(arr+2)
    // this loop reads off the end of the array because the pointer started at the second position.
    for (int i=0; i< (DIM1*DIM2); i++)
    {
	printf("i:%d  %d\n", i, *(arrp2++));
    }
    
}