#include <iostream>

class Fraction{
public:
    Fraction();
    Fraction(long num, long den);

    void setNum(long new_num);
    void setDen(long new_den);
    long getNum();
    long getDen();

    void add(Fraction other);
    void sub(Fraction other);
    void mult(Fraction other);
    void div(Fraction other);
    void inc();
    void print();
private:
    long num;
    long den;
};

long gcd(long x, long y);

Fraction::Fraction():
    num(0),
    den(1)
{
}

Fraction::Fraction(long num, long den):
    num(num),
    den(den)
{
}

void Fraction::setNum(long new_num)
{
    num = new_num;
}

void Fraction::setDen(long new_den)
{
    den = new_den;
}

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

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

void Fraction::add(Fraction other)
{
    num = num * other.den + other.num * den;
    den *= other.den;
}

void Fraction::sub(Fraction other)
{
    num = num * other.den - other.num * den;
    den *= other.den;
}

void Fraction::mult(Fraction other)
{
    num *= other.num;
    den *= other.den;
}

void Fraction::div(Fraction other)
{
    num *= other.den;
    den *= other.num;
}

void Fraction::inc()
{
    num += den;
}

void Fraction::print()
{
    long divisor = gcd(num, den);
    std::cout << num / divisor << "/" << den / divisor << std::endl;
}

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

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 = f1;
        f3.add(f2);
        f3.print();
        f4 = f1;
        f4.sub(f2);
        f4.print();
        f5 = f1;
        f5.mult(f2);
        f5.print();
        f6;
        f6.div(f2);
        f6.print();
        f7 = f1;
        f7.inc();
        f7.print();
}