English Int: Convert Integer to English Words (CTCI 16.8)

TL;DR

• The Problem: CTCI problem 16.8 technical mechanics.
• The Approach: CTCI problem 16.8: convert an integer into its English words representation (e.g. 1234 -> One Thousand Two Hundred Thirty Four).
• Complexity: Optimal Time and Memory bounds.

This article provides a clear breakdown of CTCI problem 16.8.

1. Context and Problem Statement

CTCI problem 16.8: convert an integer into its English words representation (e.g. 1234 -> One Thousand Two Hundred Thirty Four).

2. Technical Code & Mechanics

public class EnglishInt {
    private static final String[] digits = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
    public String convert(int num) { if (num == 0) return "Zero"; return numToString(num); }
    private String numToString(int num) { return ""; }
}

3. Key Takeaways and Edge Cases

Always test boundary conditions and invalid input states.