/*
大宏药业门市售卖阿司匹林和扑热息痛商品。
学生享有95折优惠。
老人享有85折优惠。
VIP享有7折优惠。
把计算优惠控件、和选择哪种优惠控件进行解耦。
当增加新年优惠时、只需针对优惠控件编程即可。
*/
class Store {
var p_doPrice : Double = 0.0
var discount = Discount()
func setPrice (p_doIntputPrice : Double) {
p_doPrice = p_doIntputPrice
}
func setDiscount (p_obDiscount : Discount) {
discount = p_obDiscount
}
func getPrice() -> Double {
return discount.calculate(p_doIntputCalPrice : p_doPrice)
}
}
class Discount {
func calculate(p_doIntputCalPrice : Double) -> Double {
return p_doIntputCalPrice
}
}
class StudentDiscount : Discount {
override func calculate(p_doIntputCalPrice : Double) -> Double {
print("Student discount:")
return p_doIntputCalPrice * 0.95
}
}
class OlderDiscount : Discount {
override func calculate(p_doIntputCalPrice : Double) -> Double {
print("Older discount:")
return p_doIntputCalPrice * 0.85
}
}
class VipDiscount : Discount {
override func calculate(p_doIntputCalPrice : Double) -> Double {
print("Older discount:")
return p_doIntputCalPrice * 0.70
}
}
var store = Store()
var p_doOriginalPrice = 60.0
var p_CurrenctPrice = 0.0
store.setPrice(p_doIntputPrice : p_doOriginalPrice)
print("Original price is : \(p_doOriginalPrice)")
var discount = Discount()
// discount = StudentDiscount()
// discount = OlderDiscount()
discount = VipDiscount()
store.setDiscount(p_obDiscount : discount)
p_CurrenctPrice = store.getPrice()
print("Discount price is: \(p_CurrenctPrice)")
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