// Interface file for FRACTION class -- fraction.h

#ifndef FRACTION_H
#define FRACTION_H

#include <iostream>

using namespace std;

class fraction
{	
   public:	
      
      // constructors	
      fraction();                // default constructor -- results in 0/1
      fraction(int num);         // one parameter  -- results in num/1    
                                 // this is a conversion constructor
      fraction(int num, int den);// two parameters -- results in num/den

      // the above three could be replaced with the single constructor
      // fraction(int num = 0, den = 1);
      // which uses default values
      
      // input and output methods
      void read(istream& iStr);  // input must be one of the following forms :
                                 //      1. integer                           
                                 //      2. integer/integer                   
                                 // Note: no spaces allowed in the fraction
      void print(ostream& oStr) const;
      void printMixed(ostream& oStr) const; // print as a mixed number if the
                                            // fraction is improper
      // accessor methods
      int num() const;           // returns the numerator
      int den() const;           // returns the denominator
      
      // arithmetic methods
      fraction add(const fraction& frac) const;  // fraction + fraction
      fraction sub(const fraction& frac) const;  // fraction - fraction
      fraction mult(const fraction& frac) const; // fraction * fraction
      fraction div(const fraction& frac) const;  // fraction / fraction
      fraction reciprocal() const;               // the reciprocal
      
      // comparison methods
      bool sameAs(const fraction& frac) const;    // equality
      bool isLessThan(const fraction& frac) const;// less than
      
   private:	
      
      // Data members	
      int numer;
      int denom;	
      
      // Function member	
      void reduce();               // reduces to lowest terms with denom > 0
};

#endif