23. The address-of operator

• 
  #include <iostream>
  using namespace std;
  
  int main()
  {
      double price = 1.52;
  
      // using address-of operator to obtain address
      // of the price variable in memory:
      double * location = &price;
  
      // The following two lines do the same thing:
      // access memory at a given location
      cout << location[ 0 ] << "\n"; // using [subscript] notation
      cout << *location << "\n";     // dereference operator *
  
      return 0;
  }