// Frac.cpp - implementation file for Frac (fraction) type

#include "Frac.h"

// Definitions of instance methods ------------------------------

Frac::Frac( void ) : nu(1), de(0)
{
}

Frac::Frac( int n, int d )
{
   nu = n;
   de = d;
}

void Frac::invert( void )
{
   int t = nu;
   
   nu = de;
   de = t;
}

int  Frac::getNumerator( void ) const
{
   return nu;
}

int  Frac::getDenominator( void ) const
{
   return de;
}

void Frac::setNumerator( int n )
{
   nu = n;
}

void Frac::setDenominator( int d )
{
   de = d;
}

void Frac::write( ostream& out )         // write fraction to ostream
{
   out << nu << '/' << de;
}

// Definitions of other Frac-related functions ------------------

ostream& operator<<( ostream& out, Frac& q )
{
   q.write( out );
   return out;
}

Frac& operator+( Frac& p, Frac& q )
{
   Frac *r = new Frac;
   
   r->setNumerator(   p.getNumerator() * q.getDenominator()
                   + p.getDenominator() * q.getNumerator() );
   r->setDenominator( p.getDenominator() * q.getDenominator() );
   return *r;
}