// curr3.h
// +, +=, << overloaded

#ifndef Currency_
#define Currency_

#include <iostream.h>
#include <stdlib.h>

enum sign {plus, minus};

class Currency {
   public:
      // constructor
      Currency(sign s = plus, unsigned long d = 0,
                              unsigned int c = 0);
      // destructor
      ~Currency() {}
      bool Set(sign s, unsigned long d,
                       unsigned int c);
      bool Set(float a);    // overloading function (different auguments)
      sign Sign() const
        {if (amount < 0) return minus;
         else return plus;}
      unsigned long Dollars() const
        {if (amount < 0) return (-amount) / 100;
         else return amount / 100;}
      unsigned int Cents() const
        {if (amount < 0)
            return -amount - Dollars() * 100;
         else return amount - Dollars() * 100;}
      Currency operator+(const Currency& x) const;

      Currency& operator+=(const Currency& x)   // if member function, z += x
                                                // is treated as z.operator+=(x)
        {amount += x.amount; return *this;}  // amount = (*this).amount
      void Output(ostream& out) const;          // if non-member function,
                                                // treated as operator+=(z, x)

   private:
      long amount;
};

Currency::Currency(sign s, unsigned long d,
                           unsigned int c)
{// Create a Currency object.
   if (c > 99)
      {// too many cents
       cerr << "Cents should be < 100" << endl;
       getchar();
       exit(1);}
   
   amount = d * 100 + c;   // total cents
   if (s == minus) amount = -amount;
}

bool Currency::Set(sign s, unsigned long d,
                           unsigned int c)
{// Reset value.
   if (c > 99) return false;
   
   amount = d * 100 + c;
   if (s == minus) amount = -amount;
   return true;
}
   
bool Currency::Set(float a)
{// Reset value.
   sign sgn;
   if (a < 0) {sgn = minus; a = -a;}
   else sgn = plus;
   amount = (a + 0.001) * 100;  
   if (sgn == minus) amount = -amount;
   return true;
}

Currency Currency::operator+(const Currency& x) const
                                  // Is the following correct?
{// Add x and *this.              // compute z + x ==> z.operator+(x)
   Currency y;                  // 'this' points to z, (*this).amount = z.amount
   y.amount = amount + x.amount;  // z.amount
   return y;                      // sum of z + x is returned
}

void Currency::Output(ostream& out) const
{// Insert currency value into stream out.
   long a = amount;
   if (a < 0) {out << '-';
               a = -a;}
   long d = a / 100; // dollars
   out << '$' << d << '.';
   int c = a - d * 100; // cents
   if (c < 10) out << "0";
   out << c;
}

// overload << , stream insertion operator
ostream& operator<<(ostream& out, const Currency& x)
   {x.Output(out); return out;}   // enables cout << i << j;

#endif