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Integer to English Words in Python Programming
Suppose we have a number. The number can be anything in between 0 to 231 – 1. We have to convert the number into words. So if the number is like 512, then the result will be Five hundred twelve.
To solve this, we will follow these steps −
Define some lists like less_than_20, this will hold all words from one to nineteen
Another array like tens to hold tens, twenty, thirty and so on up to ninety
Another array for thousands, to hold thousand, million and billion
Define one function called helper(), this will take n
if n is 0, then return blank string
otherwise when n < 20, then return less_than_20[n] + blank space
otherwise when n < 100, then return tens[n/10] + blank space + helper(n mod 10)
otherwise return less_than_20[n/100] + “Hundred” + helper(n mod 100)
From the main method, do the following
if num is 0, then return “Zero”
ans := empty string, i := 0
while num > 0
if num mod 1000 is not 0, then
ans := helper(num mod 1000) + thousands[i] + blank space + ans
return ans
Let us see the following implementation to get better understanding −
Example
class Solution(object): less_than_20 = ["", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"] tens = ["","Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"] thousands = ["", "Thousand", "Million", "Billion"] def numberToWords(self, num): if num == 0: return "Zero" ans = "" i = 0 while num > 0: if num % 1000 != 0: ans = self.helper(num % 1000) + Solution.thousands[i] + " " + ans i += 1 num //= 1000 return ans.strip() def helper(self, n): if n == 0: return "" elif n < 20: return Solution.less_than_20[n] + " " elif n < 100: return Solution.tens[n//10] + " " + self.helper(n % 10) else: return Solution.less_than_20[n // 100] + " Hundred " + self.helper(n % 100) ob = Solution() print(ob.numberToWords(512)) print(ob.numberToWords(7835271))
Input
512 7835271
Output
Five Hundred Twelve Seven Million Eight Hundred Thirty Five Thousand Two Hundred Seventy One
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