// USDollarAdd - demonstrate the definitiona and use
//               of the addition operator for the class
//               USDollar
#include <stdio.h>
#include <iostream.h>

// USDollar - represent the greenback
class USDollar
{
    // make sure that the user defined operations have 
    // access to the protected members of the class
    friend USDollar operator+(USDollar&, USDollar&);
    friend USDollar& operator++(USDollar&);

  public:
	// construct a dollar object with an initial
    // dollar and cent value
    USDollar(int d = 0, int c = 0);

    // rationalize - normalize the number of cents by
    //               adding a dollar for every 100 cents
    void rationalize()
    {
        dollars += (cents / 100);
        cents   %= 100;
    }

    // output- display the value of this object
    //         to the standard output object
    void output()
    {
        cout << "$"
             << dollars
             << "."
             << cents;
    }

  protected:
    int dollars;
    int cents;
};

USDollar::USDollar(int d, int c)
{
    // store of the initial values locally
    dollars = d;
    cents = c;

    rationalize();
}

//operator+ - add s1 to s2 and return the result
//            in a new object
USDollar operator+(USDollar& s1, USDollar& s2)
{
   int cents   = s1.cents   + s2.cents;
   int dollars = s1.dollars + s2.dollars;
   return USDollar(dollars, cents);
}

//operator++ - increment the specified argument;
//             change the value of the provided object
USDollar& operator++(USDollar& s)
{
    s.cents++;
    s.rationalize();
    return s;
}

int main(int nArgc, char* pszArgs[])
{
   USDollar d1(1, 60);
   USDollar d2(2, 50);
   USDollar d3(0, 0);

   // first demonstrate a binary operator
   d3 = d1 + d2;
            d1.output();
   cout << " + ";
            d2.output();
   cout << " = ";
            d3.output();
   cout << "\n";

   // now check out a unary operator
   ++d3;
   cout << "After incrementing it equals ";
            d3.output();
   cout << "\n";
   return 0;
}