273. Integer to English Words
Hard
Topics: Math, String, Recursion
Convert a non-negative integer num to its English words representation.
Example 1:
Example 2:
Example 3:
Constraints:
Hint:
Solution:
To solve this problem, we can follow these steps:
Define the words for numbers:We need arrays for the words representing single digits, teens, tens, and the thousands groupings.
Create a helper function:This function will handle numbers less than 1000, converting them to English words.
Recursive function:The main function will recursively process chunks of the number, adding the appropriate thousand group label (e.g., Thousand, Million, Billion).
Edge cases:Handle edge cases like 0 and numbers where intermediate chunks are zero.
Let's implement this solution in PHP:273. Integer to English Words
Explanation:
Main Function (numberToWords):
- Checks if the input number is 0 and returns "Zero".
- Initializes the thousands array with the labels for a thousand groupings.
- Iteratively processes the number in chunks of thousands, using the helper function to convert each chunk to words.
- Constructs the final result string by combining the words for each chunk with the appropriate thousand group label.
Helper Function (helper):
- Uses predefined arrays for numbers below 20 and for the tens multiples.
- Recursively constructs the English words for numbers less than 1000:
- For numbers less than 20, directly returns the corresponding word.
- For numbers less than 100, combines the word for the tens place with the result of a recursive call for the units place.
- For numbers 100 and above, combines the word for the hundreds place with the result of a recursive call for the remainder.
This solution handles the constraints and edge cases effectively, providing the correct English words representation for any number within the given range.
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