Question

Given a variable s that contains a non-empty string, write some statements that use a while loop to assign the number of lower-case vowels ("a","e","i","o","u") in the string to a variable vowel_count.

Answer 1

To count the number of lower-case vowels in a given string using a while loop in Python, initialize a variable to 0, use a while loop to iterate through the string, check if each character is a lower-case vowel, and increment the variable if it is. Finally, print the variable.

Step-by-step explanation:

To count the number of lower-case vowels in a given string, you can use a while loop in Python. Here are the steps:

1. Initialize the variable vowel_count to 0.
2. Set the variable i to 0, which will be used as the index to iterate through each character in the string.
3. Use a while loop to iterate through the string while i is less than the length of the string.
4. Inside the while loop, check if the character at the current index i is a lower-case vowel ('a', 'e', 'i', 'o', 'u'). If it is, increment the vowel_count by 1.
5. Increment the i by 1 to move to the next character in the string.
6. After the while loop, the vowel_count variable will contain the number of lower-case vowels in the string.

Here is an example:

s = 'Hello World'
vowel_count = 0
i = 0
while i < len(s):
if s[i] in 'aeiou':
vowel_count += 1
i += 1
print(vowel_count)

Answer 2

To count the number of lowercase vowels in a string using a while loop, initiate a counter and an index, iterate over each character, check if it's a vowel and increment the counter, then increment the index until reaching the end of the string.

Step-by-step explanation:

A student asked for help with a programming task using a while loop to count the number of lowercase vowels in a string. Here is an example of how the code might look in Python:

vowel_count = 0
index = 0
s = "example string with vowels"
while index < len(s):
if s[index] in 'aeiou':
vowel_count += 1
index += 1
print("The number of lowercase vowels in the string is:", vowel_count)

In this code, we first initiate vowel_count to zero, which will hold the number of vowels found. We also start an index at zero, which will be used to iterate over each character in the string s. Inside the while loop, we check if the current character is one of the lowercase vowels by using the in keyword. If it is a vowel, we increment vowel_count by 1. Otherwise, we just move to the next character by incrementing the index. The loop continues until we have inspected every character in the string.