#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);      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)        {amount += x.amount; return *this;}      void Output(ostream& out) const;   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;       exit(1);}      amount = d * 100 + c;   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{// Add x and *this.   Currency y;   y.amount = amount + x.amount;   return y;}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 <<ostream& operator<<(ostream& out, const Currency& x)   {x.Output(out); return out;}#endif