////////////////////////////////////////////
//  pointers.cpp - how do I use pointers? //
////////////////////////////////////////////
#include <iostream>
using namespace std;

void main() {

  double x;
  double *pD1 = &x;                   // pD1 holds the address of x
  *pD1 = 2.5;                         // contents of that address
                                      //   is given a value

  cout << "\n  x = " << x << ", *pD1 = " << *pD1 << '\n';

  double *pD2 = new double[3];        // memory is allocated on heap
  *pD2 = 0.5;                         // memory is filled with values
  *(pD2+1) = 1.5;                     //  using pointer arithmetic
  *(pD2+2) = 2.5;
  cout << "\n  pD2[0] = " << pD2[0]   // values are read out of memory
       << "\n  pD2[1] = " << pD2[1]   //   using array notation
       << "\n  pD2[2] = " << pD2[2]
       << "\n\n";
}