using namespace std;

class fraction
{
 long num;
 long den;

 public:
fraction(long,long);
fraction();
~fraction();
void  setNum ( long );
void  setDen ( long );
long  getNum ( void );
long    getDen ( void );

void  print  (void);

void add  (fraction, fraction);
void sub  (fraction, fraction);
void mult (fraction, fraction);
void div  (fraction, fraction);
void inc  (fraction);

}  ;   // end of class fraction

long gcd (long x, long y);

fraction::fraction(long l_num, long l_den)
{

    num = l_num;
    den = l_den;
}
fraction::fraction()
{

}
fraction::~fraction()
{


}

void fraction::setNum (long  l_num )
 {
  num = l_num ;
 }


void fraction::setDen (long l_den )
 {
  den = l_den ;
 }

long fraction::getDen ( )
 {
  return den ;
 }

long fraction::getNum ( )
 {
  return num ;
 }

void fraction:: print (void)
{
   cout<<num/gcd(num,den)<<"/"<<den/gcd(num,den) <<endl;
}

void fraction::add (fraction f1, fraction f2)
{
  num = (f1.getNum ( ) * f2.getDen ( )) + ( f1.getDen ( ) * f2.getNum ( ) );
  den = (f1.getDen ( ) * f2.getDen ( ));
}

void fraction::sub (fraction f1, fraction f2)
{
  num = (f1.getNum ( ) * f2.getDen ( )) - ( f1.getDen ( ) * f2.getNum ( ) );
  den = (f1.getDen ( ) * f2.getDen ( ));
}

 void fraction::mult (fraction f1, fraction f2)
{
  num = (f1.getNum ( ) * f2.getNum ( ));
  den = (f1.getDen ( ) * f2.getDen ( ));

}

void fraction::div(fraction f1, fraction f2)
{

 num = (f1.getNum ( ) * f2.getDen ( ));
 den = (f1.getDen ( ) * f2.getNum ( ));
 }

void fraction::inc (fraction f1)
{
  num = (f1.getNum ( )) + ( f1.getDen ( ) );
 den = (f1.getDen ( ) );

 }


long gcd (long x, long y)
{
 return (x == 0) ? y :  gcd (y%x, x);
}

int main ( )
{
 //  define seven instances of the class fraction
 fraction f1(1L,2L),f2(3L,4L),f3, f4,f5,f6, f7;

 //set values for the numerator and denominator to f1 and print them
 //f1.setDen( 2L);
   //f1.setNum( 0L);
    f1.print();

    //set values for the numerator and denominator to f2 and print them
 //f2.setDen( 4L);
 //f2.setNum( 3L);
 f2.print();

 f3.add( f1, f2);
 f3.print();

 f4.sub( f1, f2);
 f4.print();

 f5.mult( f1, f2);
 f5.print();

 f6.div( f1, f2);
 f6.print();

    f7.inc(f1);
 f7.print();

 return 0;

 }