Question

我正在创建一个折扣计算器。我无法在程序中定义变量DiscountedPrice

台式机上的Python 3.5

#programmed by 
#Discount Calculator
#Jan 29, 2018

#Explanation of program
print("This program will determine if a discount will be applied based 
off the quantity purchased. ")

#State Unit Price Variable
UnitPrice=int(99)

#State Unit Quantity Variable
UnitQuantity=int(input("Please input the number of units purchased. "))

#Calculate Initial Cost
InitialCost=UnitPrice*UnitQuantity
print("Your initial cost will be $",InitialCost)

#State the Total Cost Variable
TotalCost=InitialCost-DiscountedAmount


#Calculate equation to determine if discount will be applied
if UnitQuantity < 10:
DiscountedAmount = 0
print("There will be no discount applied to this purchase.")
elif UnitQuantity >= 10 and UnitQuantity <= 19:
DiscountedAmount = float(0.1) * UnitPrice
print("There will be a 10% discount applied to your purchase of 
$",InitialCost)
print ("Your total with discount come to $", TotalCost)
elif UnitQuantity >= 20 and UnitQuantity <= 49:
DiscountedAmount = float(0.2) * UnitPrice
print("There will be a 20% discount applied to your purchase of 
$",InitialCost)
print ("Your total with discount come to $", TotalCost)
elif UnitQuantity >= 49 and UnitQuantity <= 99:
DiscountedAmount = float(0.3) * UnitPrice
print("There will be a 30% discount applied to your purchase of 
$",InitialCost)
print ("Your total with discount come to $", TotalCost)
else: UnitQuantity >= 100
DiscountedAmount = float(0.4) * UnitPrice
print("There will be a 40% discount applied to your purchase of 
$",InitialCost)
print ("Your total with discount come to $", TotalCost)

用户输入后如果他们将获得高达40％的折扣，则应该能够显示

Answer 1

我相信您是编程的新手。 Python代码中定义的变量不是符号变量（除非您如此定义），因此，当TotalCost更改时，您不能期望DiscountedAmount的值会被更新。另外，您需要在使用变量之前对其进行初始化。

在您的代码中，如果不声明变量TotalCost=InitialCost-DiscountedAmount（请使用DiscountedAmount），就不能使用DiscountedAmount = 0。同样，这将是一次计算，并且值将存储在TotalCost中。在每种TotalCost=InitialCost-DiscountedAmount情况下，每次DiscountedAmount的值根据输入而变化时，都需要重新计算if这个表达式。

我无法定义DiscountedPrice

1 个答案: