// Frac.h - interface file for Frac (fraction) type

#if !defined(FRAC_H)
#define FRAC_H

#include <iostream>
using namespace std;

class Frac
{						       
public:                             // at least some methods must be public
   Frac();                             // default constructor
   Frac( int n, int d );               // explicit value constructor
   void invert( void );                // inverts fraction
   int  getNumerator( void ) const;    // reader for nu
   int  getDenominator( void ) const;  // reader for de
   void setNumerator( int );           // writer for nu
   void setDenominator( int );         // writer for de
   void write( ostream& out );         // write fraction to ostream

private:                            // instance var's almost always private
   int nu;                             // numerator
   int de;                             // denominator
};

ostream& operator<<( ostream&, Frac& );   // stream insert a Frac object
Frac& operator+( Frac&, Frac& );          // add two Fracs, yielding a third

#endif