我正在努力弄清楚为什么我的代码不断输出错误的值

Question

在我当前的 zybooks 实验室 3.13 中，作业要求“编写一个程序，将零钱总金额作为整数输入，并使用最少的硬币输出零钱，每行一种硬币类型。硬币类型是美元、25 美分、Dimes、Nickels 和 Pennies。适当使用单数和复数硬币名称，例如 1 Penny 与 2 Pennies。

当我提交我的作品时，我收到了 2 项要求的“0/2”。如果整数中有“0”，我需要弄清楚如何让它停止输出 'No change' 。 HALP!!!!!

这是我的代码：

user_input = int(input())

# Conditional math Block: Used to determine user input value in amount of dollars, quarters, dimes, nickles and pennies.
dollar = user_input // 100  # convert to dollars
user_input %= 100  # remainder after conversion

quarter = user_input // 25  # convert to quarters
user_input %= 25  # remainder after conversion

dime = user_input // 10  # convert to dimes
user_input %= 10  # remainder after conversion

nickel = user_input // 5  # convert to nickels
user_input %= 5  # remainder after conversion

penny = user_input

# Determines if user input is invalid.
if user_input <= 0:
    print('No change')

# Condition Block: Analyzes user input and assigns appropriate values.
if dollar > 1:  # Uses math block to determine if user input is equivalent to more than 1 Dollar.
    print(dollar, 'Dollars')
elif dollar == 1:  # Uses math block to determine if user input is equivalent to 1 Dollar.
    print(dollar, 'Dollar')

if quarter > 1:  # Uses math block to determine if user input is equivalent to more than 1 Quarter.
    print(quarter, 'Quarters')
elif quarter == 1:  # Uses math block to determine if user input is equivalent to 1 Quarter.
    print(quarter, 'Quarter')

if dime > 1:   # Uses math block to determine if user input is equivalent to more than 1 Dime.
    print(dime, 'Dimes')
elif dime == 1:  # Uses math block to determine if user input is equivalent to 1 Dime.
    print(dime, 'Dime')

if nickel > 1:   # Uses math block to determine if user input is equivalent to more than 1 nickel.
    print(nickel, 'Nickels')
elif nickel == 1:  # Uses math block to determine if user input is equivalent to 1 nickel.
    print(nickel, 'Nickel')

if penny > 1:  # Uses math block to determine how many Pennies' user input is equivalent to.
    print(penny, 'Pennies')
elif penny == 1:  # Uses math block to determine how many Pennies' user input is equivalent to.
    print(penny, 'Penny') ```

Answer 1

您可以在计算前打印"No change"。

user_input = int(input())
if user_input <= 0: 
    print('No change')
dollar = user_input//100
user_input %= 100
#the rest

Answer 2

问题的症结在于你这样做：

if user_input <= 0:
    print('No change')

在之后你已经减少了user_input的值——例如，这一行：

user_input %= 10  # remainder after conversion

如果

是任何以 0 结尾的数字，则 user_input 将减少为零。

您想要做的是在开始修改用户输入之前测试“无变化”情况，或者根据所有您积累的各种 dollars、dimes 等值。

FWIW，我建议首先不要将所有这些东西存储在复制+粘贴变量中。下面是一个示例，说明如何通过预先定义所有硬币类型，然后使用每个硬币的适当值重复操作来循环完成整个操作：

total = int(input()) if total <= 0: print("No change") else: for value, s_name, p_name in [ (100, "Dollar", "Dollars"), (25, "Quarter", "Quarters"), (10, "Dime", "Dimes"), (5, "Nickel", "Nickels"), (1, "Penny", "Pennies"), ]: qty = total // value if not qty: continue print(f"{qty} {p_name if qty > 1 else s_name}") total %= value

我正在努力弄清楚为什么我的代码不断输出错误的值

I am struggling to figure out why my code keeps outputting the wrong values

python

lab