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# Number to words using the num2words library
# Install: pip install num2words

from num2words import num2words

# Basic conversion (English)
print(num2words(42))          # forty-two
print(num2words(1000000))     # one million
print(num2words(1234567))     # one million, two hundred and thirty-four thousand,
                              #   five hundred and sixty-seven

# Ordinal numbers
print(num2words(1, to='ordinal'))   # first
print(num2words(42, to='ordinal'))  # forty-second
print(num2words(100, to='ordinal')) # one hundredth

# Other languages
print(num2words(42, lang='de'))    # zweiundvierzig
print(num2words(42, lang='fr'))    # quarante-deux
print(num2words(42, lang='es'))    # cuarenta y dos
print(num2words(42, lang='ja'))    # 四十二

# Currency (year) mode
print(num2words(2024, to='year'))  # twenty twenty-four

# Without the library: simple custom implementation
ones = ['', 'one', 'two', 'three', 'four', 'five', 'six',
        'seven', 'eight', 'nine', 'ten', 'eleven', 'twelve',
        'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen',
        'eighteen', 'nineteen']
tens = ['', '', 'twenty', 'thirty', 'forty', 'fifty',
        'sixty', 'seventy', 'eighty', 'ninety']

def number_to_words(n: int) -> str:
    if n == 0: return 'zero'
    if n < 0:  return 'negative ' + number_to_words(-n)
    if n < 20: return ones[n]
    if n < 100:
        return tens[n // 10] + (('-' + ones[n % 10]) if n % 10 else '')
    if n < 1000:
        rest = number_to_words(n % 100)
        return ones[n // 100] + ' hundred' + (' and ' + rest if rest else '')
    if n < 1_000_000:
        rest = number_to_words(n % 1000)
        return number_to_words(n // 1000) + ' thousand' + (', ' + rest if rest else '')
    rest = number_to_words(n % 1_000_000)
    return number_to_words(n // 1_000_000) + ' million' + (', ' + rest if rest else '')

print(number_to_words(42))       # forty-two
print(number_to_words(100))      # one hundred
print(number_to_words(1234))     # one thousand, two hundred and thirty-four