Lecture 102:- Integer to English Words

Converting an integer to its English word representation is a complex task. Here's a Python function that can handle integer numbers up to 2^31 - 1:

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def number_to_words(num):    if num == 0:        return "Zero"    ones = ["", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"]    teens = ["", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"]    tens = ["", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"]    thousands = ["", "Thousand", "Million", "Billion"]    def helper(num):        if num == 0:            return ""        elif num < 10:            return ones[num]        elif num < 20:            return teens[num - 10]        elif num < 100:            return tens[num // 10] + " " + helper(num % 10)        else:            return ones[num // 100] + " Hundred " + helper(num % 100)    words = ""    i = 0    while num > 0:        if num % 1000 != 0:            words = helper(num % 1000) + thousands[i] + " " + words        num //= 1000        i += 1    return words.strip() # Test the function print(number_to_words(1234567))  # Output: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven" print(number_to_words(123))      # Output: "One Hundred Twenty Three" print(number_to_words(0))        # Output: "Zero"

The number_to_words function breaks down the integer into groups of three digits (thousands) and then converts each group to its English word representation. The helper function is used to convert numbers less than 1000 to words. The thousands array is used to add appropriate place values like "Thousand," "Million," or "Billion" to the result.

Please note that this function handles numbers up to 2^31 - 1 (signed 32-bit integer range). If you need to handle larger numbers, you may need to modify the function accordingly.