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

int main(int argc, char *argv[]) { 
  int i;
  int *x = malloc(sizeof(int) * 6);

  // add 0 to x, dereference the result and put the value 1 
  x[0] = 1;

  // add 1 * sizeof(int) to x, dereference the result and put the value 2
  *(x+1) = 2;

  // add i (2) to x, dereference the result and put the value 3
  i = 2; 
  x[i] = 3;

  // add 3 * sizeof(int) to the address x, dereference the result and put 4
  i++; 
  i[x] = 4;

  // add 4 * sizeof(int) to the address x, dereference the result and put 5
  i++; 
  *(x + i) = 5;
  
  // add 5 * sizeof(int) to the address x, dereference the result and put 6
  x += 5; 
  *x = 6; 

  // subtract 5 * sizeof(int) from x and then use x as an array
  x -= 5;
  
  printf("%d %d %d %d %d %d\n", x[0], x[1], x[2], x[3], x[4], x[5]); 

  free( x );

  // is the data still there?
  printf("%d %d %d %d %d %d\n", x[0], x[1], x[2], x[3], x[4], x[5]); 

  return(0);
}