How Can Integers Be Efficiently Converted to Their Written Forms Without Using a Lookup Table?

High-Performance Integer-to-Word Conversion: A Lookup-Table-Free Approach

This article presents an efficient method for converting integers to their written representations without relying on large lookup tables. The solution leverages a recursive algorithm and pre-defined arrays for handling different number ranges.

Algorithm Design:

The core algorithm breaks down the input integer into its individual components (units, tens, hundreds, etc.). These components are then recursively combined using the FriendlyInteger function to generate the textual representation. Pre-defined arrays (ones, teens, tens, thousandsGroups) store the word equivalents for various number ranges.

C# Implementation:

The provided C# code (HumanFriendlyInteger) implements this algorithm. Key functions include:

• FriendlyInteger: Recursively converts the integer to its written form.
• IntegerToWritten: Handles special cases like negative numbers and zero, and calls FriendlyInteger for the main conversion process.

Functionality and Advantages:

The code accurately transforms integers into their textual counterparts (e.g., 21 becomes "Twenty One"). The key advantages are:

• Eliminates the need for extensive lookup tables: Dynamic combination of number parts avoids the storage overhead of large lookup databases.
• Scalability: Handles integers of arbitrary size efficiently.
• Modular Design: The use of separate functions enhances flexibility and allows for easy customization of output formatting.

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