#include <stdio.h>

int main(void) {

  int i, j, k;
  int sum1 = 0, sum2 = 0;
  int a[2][3] = {{1, 2, 3}, {4, 5, 6}};

  for (i = 0; i < 2; i++)        /* Revealing sequence of access */ 
    for (j = 0; j < 3; j++){
      printf("a[%1d,%1d] = %d\n", i, j, a[i][j]);
      sum1 += a[i][j];  
    }

  printf("\n\n");

  for (k = 0; k < 2 * 3; k++){   /* Revealing sequence of access */ 
    printf("Element %1d = %d\n", k, *(&a[0][0] + k));
    sum2 += *(&a[0][0] + k);  
  } 

  printf("\n\n");

  printf("First method:  the sum is: %d\n", sum1);
  printf("Second method: The sum is: %d\n", sum2);
  
  return 0;
}