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1. Reverse String Recursively2. Check Palindrome String Recursively3. Count Vowels Recursively4. Remove Spaces Recursively5. Replace Character Recursively6. Remove Occurrences Recursively7. Print Characters Recursively8. Uppercase Conversion Recursively9. Count Vowels & Consonants Recursively10. Reverse String Words Recursively

Count Vowels Recursively

Count vowels in a string recursively.

AdvancedPhase 3 - Level 4: String-based RecursionExample 3 of 10
count-vowels-recursively.py
1def count_vowels(s, index=0):
2    # Base case
3    if index >= len(s):
4        return 0
5    
6    # Check current character
7    vowels = "aeiouAEIOU"
8    count = 0
9    if s[index] in vowels:
10        count = 1
11    
12    # Recurse
13    return count + count_vowels(s, index + 1)
14

15# Test
16text = input("Enter a string: ")
17result = count_vowels(text)
18print(f"Number of vowels: {result}")

Output

Enter a string: Hello
Number of vowels: 2

What's going on

Check current character, recurse on rest.

Key Concepts:

Base case: index >= len(s)
Check if current char is vowel
Add 1 if vowel, recurse with index+1

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