fraction

#include <iostream>

class Fraction{
    long num;
    long den;
public:
    void setNum(int);
    void setDen(int);
    int getNum();
    int getDen();
    long gcd(long,long);
    Fraction add(Fraction,Fraction);
    Fraction sub(Fraction,Fraction);
    Fraction mult(Fraction,Fraction);
    Fraction div(Fraction,Fraction);
    Fraction inc(Fraction);
    void print();
};
void Fraction::setNum(int num)
{
    Fraction::num = num;
}
void Fraction::setDen(int den)
{
    Fraction::den = den;
}
int Fraction::getNum()
{
    return Fraction::num;
}
int Fraction::getDen()
{
    return Fraction::den;
}
long Fraction::gcd(long x, long y)
{
    return (x==0)?y:gcd(y%x,x);
}
Fraction Fraction::add(Fraction first, Fraction second)
{
    Fraction sum;
    sum.setNum(first.num*second.den+second.num*first.den);
    sum.setDen(first.den*second.den);
    return sum;
}
Fraction Fraction::sub(Fraction first, Fraction second)
{
    Fraction dif;
    dif.setNum(first.num*second.den-second.num*first.den);
    dif.setDen(first.den*second.den);
    return dif;
}
Fraction Fraction::mult(Fraction first, Fraction second)
{
    Fraction prod;
    prod.setNum(first.num*second.num);
    prod.setDen(first.den*second.den);
    return prod;
}
Fraction Fraction::div(Fraction first, Fraction second)
{
    Fraction div;
    div.setNum(first.num*second.den);
    div.setDen(first.den*second.num);
    return div;
}
/*Fraction Fraction::inc(Fraction f)
{
    Fraction temp;
    temp.setNum(num+=den);
    return temp;
}*/
void Fraction::print()
{
    Fraction f;
    f.setNum(Fraction::getNum()/gcd(Fraction::getNum(),Fraction::getDen()));
    f.setDen(Fraction::getDen()/gcd(Fraction::getNum(),Fraction::getDen()));
    std::cout<<f.getNum()<<"/"<<f.getDen()<<"\n";
}
int main()
{
        Fraction f1, f2, f3, f4, f5, f6, f7;
        f1.setDen(2L);
        f1.setNum(0L);
        f1.print();
        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();
}