static void HaveADrink(HotDrink h)
{
h.AddMilk();
h.Drink();
if (h is ICup)
{
ICup cupOfDrink = h as ICup;
//ICup cupOfDrink =(ICup)h;
cupOfDrink.Wash();
}
}
static void UseHotdrinks(HotDrink hotDrink)
{
hotDrink.AddMilk();
hotDrink.Drink();
// Book Solution
// Because not all HotDrinks have to be ICups, check
if (hotDrink is ICup)
{
((ICup)hotDrink).Wash();
}
}