static void Main(string[] args)
{
Rational rational = new Rational(1, 3);
Rational another = new Rational(1, 2);
rational.Add(another);
Console.WriteLine("Sum: " + rational.Numerator + "/" + rational.Denominator);
ShoppingCart cart = new ShoppingCart();
cart.AddProduct(1400);
cart.AddProduct(17);
cart.Checkout();
}
public void Add(Rational other)
{
int commonDenominator = Denominator * other.Denominator;
Numerator = Numerator * other.Denominator + other.Numerator * Denominator;
Denominator = commonDenominator;
}