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


#define ROWS 3
#define COLS 2

int ** buildArray(int row, int column){
  int ** array = (int **)calloc(row, sizeof(int *));

  for (int i = 0; i < row ; i++){
    array[i] = (int *)calloc(column, sizeof(int));
  }
  return array;
}



int main(int argc, char * argv[]){
  int ** a = buildArray(ROWS, COLS);
  int b[ROWS][COLS];

  
  for (int i = 0; i < ROWS; i++){
    for (int j = 0; j < COLS; j++){
      a[i][j] = i* COLS+j;
      b[i][j] = i * COLS + j;

    }
  }


  printf("A: \n");
  for (int i = 0; i < ROWS; i++){
    for (int j = 0; j < COLS; j++){

      printf("a[%d][%d] = %d [%p]\n", i, j, a[i][j], &a[i][j]);

    }
    printf("\n");
  }

 printf("B: \n");
for (int i = 0; i < ROWS; i++){
    for (int j = 0; j < COLS; j++){

      printf("b[%d][%d] = %d [%p]\n", i, j, b[i][j], &b[i][j]);

    }
    printf("\n");
  }


 printf("A via pointer math: \n");
  int *ap = a[0];

  for (int i = 0; i < ROWS*COLS; i++){
    printf("%x ", ap[i]);
  }
  printf("\n\n");


   printf("B via pointer math: \n");
  int *bp = b[0];

  for (int i = 0; i < ROWS*COLS; i++){
    printf("%x ", bp[i]);
  }
  printf("\n");

  return 0;
}