Overloaded operators

Примеры:
fraction opeartor * (fraction f1, fraction f2)
{
fraction product;
product.num = f1.num * f2.num;
product.den = f1.den * f2.den;
return product;
}

ostream& opeartor <<  (ostream& out, fraction& f)
{
out << f.num << '/' << f.den;
return out;
}