while True 和 if 语句打印相同的计算

Question

我正在开发一个英尺到英寸的转换器，它实际上非常容易创建，就像我以前做过的那样。但是这次，我需要使用 while 循环。基本上，如果脚数等于 0，它应该打印 'the program has finished successfully.' 如果脚数大于或等于 1，代码将继续计算，直到用户输入 0 退出脚本。我的问题是，当我测试退出脚本时，它会打印： “0 英尺 = 0 英寸该程序已成功完成。” 我只希望它打印终止消息，而不是 0 英尺 = 0 英寸。我不知道我做错了什么。

def feet_to_inches(feet):
return 12 * feet

feet = int(input('Enter the number of feet (or 0 to end): '))
inches = feet_to_inches(feet)
print(f'{feet} feet = {inches} inches')

while True:
    if feet == 0:
        print('The program has finished successfully.')
        break
    ...       
    if feet >= 1:
        feet = int(input('Enter the number of feet (or 0 to end): '))
        inches = feet_to_inches(feet)
        print(f'{feet} feet = {inches} inches')
        continue

Answer 1

我已经为需要的更改添加了评论

几件事：

缩进错误（可能是 Whosebug 的问题）
由于您将需要用户输入来决定是否退出循环，因此您可以在循环中请求输入，然后再决定要做什么
最后不需要继续

建议代码：

def feet_to_inches(feet):
    return 12 * feet #indentation error

while True:
    feet = int(input('Enter the number of feet (or 0 to end): ')) #moving input inside the while loop
    inches = feet_to_inches(feet)
    if feet == 0:
        print('The program has finished successfully.')
        break     
    elif feet >= 1:
        # feet = int(input('Enter the number of feet (or 0 to end): '))#not required
        # inches = feet_to_inches(feet) #not required
        print(f'{feet} feet = {inches} inches')
        # continue #this is not required

输出：

Enter the number of feet (or 0 to end): 1
1 feet = 12 inches
Enter the number of feet (or 0 to end): 2
2 feet = 24 inches
Enter the number of feet (or 0 to end): 3
3 feet = 36 inches
Enter the number of feet (or 0 to end): 0
The program has finished successfully.

Answer 2

请参阅下面的代码，它也检查默认大小写。

def feet_to_inches(feet):
    return 12 * feet # Please be aware your indentation error

while True:
    feet = int(input('Enter the number of feet (or 0 to end): '))
    inches = feet_to_inches(feet)
    if feet == 0:
        print('The program has finished successfully.')
        break     
    elif feet >= 1:
        print(f'{feet} feet = {inches} inches')
    else:
      print(f'Please provide a positive value')

示例输出：

Enter the number of feet (or 0 to end): 2
2 feet = 24 inches
Enter the number of feet (or 0 to end): 1
1 feet = 12 inches
Enter the number of feet (or 0 to end): -8
Please provide a positive value
Enter the number of feet (or 0 to end): 23
23 feet = 276 inches
Enter the number of feet (or 0 to end): 0
The program has finished successfully.

Answer 3

这是 feet-to-inches 转换器的备用代码结构。

while True:
    feet = int(input('Please enter the number of feet (or 0 to end): '))
    if feet == 0:
        print('Program ended successfully.')
        break
    elif feet < 0:
        print('Please enter a positive value.')
        continue
    else:
        feet_to_inches = 12 * feet
        print('%d feet converts to %d inches'%(feet, feet_to_inches))

while True 和 if 语句打印相同的计算

while True and if statement printing the same calculation

python

if-statement

converters

while-loop

python-3.8