#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 Add(const Currency& x) const;      Currency& Increment(const Currency& x)        {amount += x.amount; return *this;}      void Output() 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::Add(const Currency& x) const{// Add x and *this.  Currency y;  y.amount = amount + x.amount;  return y;}void Currency::Output() const{// Output currency value.   long a = amount;   if (a < 0) {cout << '-';               a = -a;}   long d = a / 100; // dollars   cout << '$' << d << '.';   int c = a - d * 100; // cents   if (c < 10) cout << "0";   cout << c;}#endif