#include <iostream>
using namespace std;

int main() {
   // p is a pointer to a pointer to an int,
   // allocate memory for pointer to int
   int** p = new int*[10];

   // now allocate an int for each element and intitialize to the value of i
   for (int i=0; i<10; i++) {
      p[i] = new int(i);
   }

   // print as though it's a 2D array, second dimension only has one element
   for (int i=0; i<10; i++)
      cout << p[i][0] << " ";
   cout << endl;                  // displays 0 1 2 3 4 5 6 7 8 9

   // treat one subscript as a pointer, get to p[i] and dereference
   for (int i=0; i<10; i++)
      cout << *p[i] << " ";
   cout << endl;                  // displays 0 1 2 3 4 5 6 7 8 9

   // use p[i] and dereference, increment the contents of the element
   for (int i=0; i<10; i++)
      (*p[i])++; 

   // display again
   for (int i=0; i<10; i++)
      cout << *p[i] << " ";
   cout << endl;                  // displays 1 2 3 4 5 6 7 8 9 10

   // print again using pointer arithmetic and pointers to pointers
   for (int i=0, **ptr=p; i<10; i++, ptr++)
      cout << **ptr << " ";
   cout << endl;                  // displays 1 2 3 4 5 6 7 8 9 10

   return 0;
}