/* This a more practical example of a new data type in C++   MONEY!
*/
#include <stream.h>

class Money{ // This is *actually* a special case: 
		// Dollars and cents
		// Optimized for computation rather than display
	long int d;
	short int c;
		// Invariant:  -99<=c<=99, sign(d)==sign(c).
		// Model:  money=d+c*0.01 (decimal)
public:
     //Initalizations and casts.
	Money() :d(0),c(0){ } //clean initial values
	Money(const int n) :d(n), c(0){ } //conversion(cast)
	Money(const int d0, int c0) 
		{ d=d0 ; c=(d<0?-c0:c0); 
		} 
	Money(const double n) { d=(int)n ; c=100*(int(n)-d); } 
	
     //a method for outputing Money.
	friend ostream& operator<<(ostream& s, Money n)
	{ if(n.d>=0)
		{ 
		  s<<" $" << (n.d)<<"." 
		   << (n.c<10?"0":"") <<n.c; 
		}
	  else // n.d <0
		{
		  s<<"-$" << (-n.d)<<"." 
		   << (-n.c<10?"0":"") << -n.c; 
		}
	  return s;
	}

     //arithmetic operators  -- money does not divide and $2.1*$2.2 is silly.
	friend Money operator+(Money a, Money b) 
	   { int cc; cc= a.c+b.c;
		return Money(a.d + b.d+cc/100, cc%100) ; 
	   }
	       Money operator*(int b)
		{ int cc; cc=c*b;
		  if ( d>0 )
			  return Money(d * b+cc/100, cc%100) ;
		  else
			  return Money(d * b+cc/100, ((-cc)%100)  ) ;
		}
	       Money operator-() { return Money( - d, -c ); }
	friend Money operator-(Money a, Money b) { return a + (- b) ; }

     //Overload the comparison operators
	friend int operator<(Money a, Money b) 
	{ if (a.d < b.d) return 1;
	  else if (a.d == b.d) return a.c<b.c ; 
	  else return 0;
	}
	friend int operator>(Money a, Money b) 
	{ return b < a ; 
	}
	friend int operator>=(Money a, Money b) 
	{ if (a.d >= b.d) return 1;
	  else if (a.d == b.d) return a.c>=b.c ; 
	  else return 0;
	}
	friend int operator<=(Money a, Money b) 
	{ return b >= a ; 
	}
	friend int operator==(Money a, Money b) 
	{ return a.d == b.d && a.c == b.c; 
	}
	friend int operator!=(Money a, Money b) 
	{ return !( a == b); 
	}

	int dollars();
	int cents();
}; // end class Money

//Sample of placing definition outside class
inline int Money::dollars(){return d;}
inline int Money::cents(){return c;}
// inline implies direct substitution of code, not function call(faster)

main()
{
	Money a,b,c; int i;

	a=Money(4,20); b=Money(-4,20); c=Money(100);
	cout <<"a="<< a << " ";
	cout <<"b="<< b << " ";
	cout<<"c = "<< c<< "\n";
	
	if( a<b) cout << "a<b\n"; else cout << "not a<b\n";
	if( a==b) cout << "a==b\n"; else cout << "not a==b\n";
	if( a<=b) cout << "a<=b\n"; else cout << "not a<=b\n";
	cout<<"-b = "<< (-b) <<"\n";
	cout<<"a+b = "<< (a+b) <<"\n";
	cout<<"a-b = "<< (a-b) <<"\n";
	cout<<"a.dollars ="<<a.dollars()<<"\n";

	for( i = 0; i<=10; i++){
		cout<<"a*"<<i<<" = "<< (a*i) << ",  ";
		cout<<"b*"<<i<<" = "<< (b*i) <<"\n";
	}
}