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1. Count Digits Recursively2. Reverse Number Recursively3. Check Palindrome Recursively4. Product of Digits Recursively5. GCD Recursively6. Convert Number to Binary Recursively7. Print Digits in Words8. Sum of First N Even Numbers Recursively9. Sum of First N Odd Numbers Recursively10. nCr Recursively (Pascal Formula)

Print Digits in Words

Print digits of a number in words recursively.

IntermediatePhase 3 - Level 2: Advanced RecursionExample 7 of 10
print-digits-in-words.py
1def print_digit_word(digit):
2    words = ["Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"]
3    return words[digit]
4

5def digits_in_words(n):
6    # Base case
7    if n == 0:
8        return
9    
10    # Recursive case
11    digits_in_words(n // 10)
12    digit = n % 10
13    print(print_digit_word(digit), end=" ")
14

15# Test
16num = int(input("Enter a number: "))
17digits_in_words(abs(num))
18print()

Output

Enter a number: 123
One Two Three

What's going on

Recurse first, then print current digit.

Key Concepts:

Recurse on remaining digits first
Print current digit word after recursion
Processes digits left to right

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