```
public class Solution
extends Object
```
273 - Integer to English Words\. Hard Convert a non-negative integer `num` to its English words representation. **Example 1:** **Input:** num = 123 **Output:** "One Hundred Twenty Three" **Example 2:** **Input:** num = 12345 **Output:** "Twelve Thousand Three Hundred Forty Five" **Example 3:** **Input:** num = 1234567 **Output:** "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven" **Example 4:** **Input:** num = 1234567891 **Output:** "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One" **Constraints:** * 0 <= num <= 2³¹ - 1

public String numberToWords(int num)

Class Solution