public SnackPile(Snack snack, int quantity, decimal price) : this()
{
if (quantity < 0)
{
throw new InvalidOperationException();
}
if (price < 0)
{
throw new InvalidOperationException();
}
if (price % 0.01m > 0)
{
throw new InvalidOperationException();
}
Snack = snack;
Quantity = quantity;
Price = price;
}