Fraction Program 2... ( This is a nicer version)

/*
    This is the nicer version of the
    fraction program

    like the last one I'm not going to simplify the fractions.
*/

#include <iostream>

using namespace std;

// Fraction Class
struct Fraction {
    int num, dem;

    Fraction() : num(0), dem(0) {}

    Fraction(int _num, int _dem) : num(_num), dem(_dem) {}

    Fraction& operator = (const Fraction& f) {
        num = f.num;
        dem = f.dem;
        return *this;
    }

    Fraction operator + (Fraction& f) {
        Fraction temp = *this, temp2 = f, ret;
        equalize(temp, temp2);
        ret.num = temp.num + temp2.num;
        ret.dem = temp.dem;
        return ret;
    }

    Fraction operator - (Fraction& f) {
        Fraction temp = *this, temp2 = f, ret;
        equalize(temp, temp2);
        ret.num = temp.num - temp2.num;
        ret.dem = temp.dem;
        return ret;
    }

    Fraction operator * (Fraction& f) {
        Fraction temp;
        temp.num = num*f.num;
        temp.dem = dem*f.dem;
        return temp;
    }

    Fraction operator / (Fraction& f) {
        Fraction temp;
        temp.num = num*f.dem;
        temp.dem = dem*f.num;
        return temp;
    }

    private:

    void equalize(Fraction& f1, Fraction& f2) {
        if(f1.dem != f2.dem) {
            Fraction temp = f1, temp2 = f2;

            f1.num *= temp2.dem;
            f1.dem *= temp2.dem;
            f2.num *= temp.dem;
            f2.dem *= temp.dem;
        }
    }
};

// Making the Fraction class output streamable :D
ostream& operator << (ostream& out, Fraction& frac) {
    out << frac.num << "/" << frac.dem;
    return out;
}

// Making the Fraction class input streamable :D
istream& operator >> (istream& in, Fraction& frac) {
    in >> frac.num;
    cout << "__" << endl;
    in >> frac.dem;
    return in;
}

// Prints the answer
void print_answer(char op, Fraction& a, Fraction& f1, Fraction& f2) {
    cout << a << " = " << f1 << " " << op << " " << f2 << endl;
}

int main() {
    unsigned char op;
    Fraction fraction1, fraction2, answer;

    cout << "Please type in the first fraction" << endl;
    cin >> fraction1;

    cout << "Please type in the second fraction" << endl;
    cin >> fraction2;

    cout << "Please type int the operator, (+, -, *, /) " << endl;

    cin >> op;

    if(op == '+') {
        answer = fraction1 + fraction2;
        print_answer(op, answer, fraction1, fraction2);
    } else if(op == '-') {
        answer = fraction1 - fraction2;
        print_answer(op, answer, fraction1, fraction2);
    } else if(op == '*') {
        answer = fraction1 * fraction2;
        print_answer(op, answer, fraction1, fraction2);
    } else if(op == '/') {
        answer = fraction1 / fraction2;
        print_answer(op, answer, fraction1, fraction2);
    } else {
        cout << "Invalid operator " << op << " please use (+, -, *, /)" << endl;
    }

    return 0;
}