// USDollarCast - demonstrate how to write a cast
//                operator; in this case, the
//                cast operator converts a USDollar
//                into a double and the constructor
//                converts it back
#include <stdio.h>
#include <iostream.h>

class USDollar
{
  public:    
    // constructor to build a dollar from a double
    USDollar(double value = 0.0);

    //the following function acts as a cast operator
    operator double()
    {
        return dollars + cents / 100.0;
    }

    // display - simple debug member function
    void display(char* pszExp, double dV)
    {
        cout << pszExp
             << " = $" << dollars << "." << cents
             << " (" << dV << ")\n";
    }

  protected:
    int dollars;
    int cents;
};

// constructor - divide the double value into its
//               integer and fractional parts
USDollar::USDollar(double value)
{
	dollars = (int)value;
	cents = (int)((value - dollars) * 100 + 0.5);
}

int main()
{
    USDollar d1(2.0), d2(1.5), d3, d4;
   
    //invoke cast operator explicitly...
    double dVal1 = (double)d1;
    d1.display("d1", dVal1);

    double dVal2 = (double)d2;
    d2.display("d2", dVal2);

    d3 = USDollar((double)d1 + (double)d2);
    double dVal3 = (double)d3;
    d3.display("d3 (sum of d1 and d2 w/ casts)", dVal3);

    //...or implicitly
    d4 = d1 + d2;
    double dVal4 = (double)d3;
    d4.display("d4 (sum of d1 and d2 w/o casts", dVal4);

    return 0;
}