Problem
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Number of Vowels
Certification: Basic Level
Accuracy: 77.78%
Submissions: 9
Points: 5
Write a Python program that counts the number of vowels (a, e, i, o, u) in a given string.
Example 1
- Input: s = "Hello World"
- Output: 3
- Explanation:
- Step 1: Initialize a counter variable to 0.
- Step 2: Iterate through each character in the string "Hello World".
- Step 3: Check if each character is a vowel (a, e, i, o, u) in either lowercase or uppercase.
- Step 4: Vowels found: 'e' in "Hello", 'o' in "Hello", and 'o' in "World".
- Step 5: Increment counter for each vowel found (total: 3).
- Step 6: Return the final count of vowels: 3.
Example 2
- Input: s = "C sharp"
- Output: 1
- Explanation:
- Step 1: Initialize a counter variable to 0.
- Step 2: Iterate through each character in the string "C sharp".
- Step 3: Check if each character is a vowel (a, e, i, o, u) in either lowercase or uppercase.
- Step 4: Only one vowel found: 'a' in "sharp".
- Step 5: Increment counter once (total: 1).
- Step 6: Return the final count of vowels: 1.
Constraints
- 1 ≤ len(string) ≤ 10^6
- The string may contain uppercase and lowercase letters.
- The string contains printable ASCII characters.
- Time Complexity: O(n), where n is the length of the string.
- Space Complexity: O(1), it is using a counter.
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The following are the steps to count the number of vowels in a string:
- Iterate with a loop: Use a loop to check each character and count vowels.
- Use list comprehension: sum(1 for char in s if char.lower() in "aeiou").
- Use regular expressions: len(re.findall(r'[aeiouAEIOU]', s)).
- Convert to lowercase: Convert the string to lowercase for easier comparison.