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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

Uppercase Conversion Recursively

Convert string to uppercase recursively.

AdvancedPhase 3 - Level 4: String-based RecursionExample 8 of 10
uppercase-conversion-recursively.py
1def to_upper(s, index=0):
2    # Base case
3    if index >= len(s):
4        return ""
5    
6    # Convert current character
7    char = s[index].upper()
8    # Recurse
9    return char + to_upper(s, index + 1)
10

11# Test
12text = input("Enter a string: ")
13result = to_upper(text)
14print(f"Uppercase: {result}")

Output

Enter a string: Hello
Uppercase: HELLO

What's going on

Convert each character to uppercase.

Key Concepts:

Base case: index >= len(s)
Convert current char to uppercase
Concatenate and recurse

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