如何使用 while 循环解决此问题

Question

作业：

考虑包含值Great things never come from comfort zones的字符串 's' 。

使用while循环确定其中存在的元音编号。将数字存储在变量count中，然后打印出来。

法典：

s="Great things never come from comfort zones"
vowels=["a","e","i","o","u"]
count=0
while chars in s:
if chars in vowels:
count=count+1

我知道如何使用for循环来解决这个问题，但试图在循环中解决这个问题while但出现错误。

我想我在增加while循环时犯了一些错误。

Answer 1

s = "Great things never come from comfort zones"
vowels = ["a","e","i","o","u"]
count = 0
while len(s) > 0:
char = s[-1] # assign last character of 's' to 'char' important to do this first
s = s[:-1] # now remove the last character from 's'
if char in vowels:
count += 1
print(count)

您需要定义一个条件来终止 while 循环。在这里，我们从"s"中剪切字符，直到它为空(s = '' 或 len(s( = 0(，然后 while 循环将终止。