Converting Numbers to Words Using Classes C#

To convert numbers to words using classes in C#, you can create a class that encapsulates the logic for converting numerical values to their corresponding word representations. Below is a complete example of how you can achieve this.

Step 1: Create the NumberToWords Class

First, let's create a class called NumberToWords that will handle the conversion of numbers to words.

using System; namespace NumberConversion { public class NumberToWords { private static readonly string[] units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] teens = { "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] tens = { "", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; private static readonly string[] thousands = { "", "Thousand", "Million", "Billion" }; public static string ConvertToWords(int number) { if (number == 0) return units[0]; if (number < 0) return "Minus " + ConvertToWords(Math.Abs(number)); string words = ""; int[] numParts = new int[4]; int firstPart = 0; // Split number into thousands parts for (int i = 0; number > 0; i++) { numParts[i] = number % 1000; number /= 1000; if (numParts[i] > 0) firstPart = i; } // Convert each part to words for (int i = firstPart; i >= 0; i--) { if (numParts[i] == 0) continue; string partWord = ConvertPartToWords(numParts[i]); words += partWord + " " + thousands[i] + " "; } return words.Trim(); } private static string ConvertPartToWords(int number) { string words = ""; if (number / 100 > 0) { words += units[number / 100] + " Hundred "; number %= 100; } if (number / 10 > 1) { words += tens[number / 10] + " "; number %= 10; } else if (number / 10 == 1) { words += teens[number % 10] + " "; return words.Trim(); } if (number > 0) { words += units[number] + " "; } return words.Trim(); } } } 

Step 2: Using the NumberToWords Class

Now, you can use the NumberToWords class to convert numbers to words in your application.

using System; using NumberConversion; namespace NumberToWordsExample { class Program { static void Main(string[] args) { Console.WriteLine("Enter a number to convert to words:"); if (int.TryParse(Console.ReadLine(), out int number)) { string words = NumberToWords.ConvertToWords(number); Console.WriteLine($"Number in words: {words}"); } else { Console.WriteLine("Invalid input. Please enter a valid integer."); } } } } 

Explanation

1. Arrays for Word Representation:

   • units: Holds word representations for single digits.
   • teens: Holds word representations for numbers 10 to 19.
   • tens: Holds word representations for multiples of ten.
   • thousands: Holds word representations for thousands, millions, billions, etc.

2. ConvertToWords Method:

   • Handles conversion of the entire number to words.
   • Deals with negative numbers and zero.
   • Splits the number into groups of thousands and processes each group.

3. ConvertPartToWords Method:

   • Converts a number less than 1000 to words.
   • Handles hundreds, tens, and units.

4. Main Program:

   • Reads an integer from the user.
   • Converts the integer to words using the NumberToWords class.
   • Displays the result.

This approach ensures that the logic for converting numbers to words is encapsulated within a dedicated class, making the code modular and reusable.

Examples

1. How to create a C# class to convert numbers to words?

   • Description: Define a class that converts integers to their English word representations.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number) { if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(42)); // Output: Forty-Two } } 

2. How to handle numbers from 100 to 999 in C# number-to-words conversion?

   • Description: Extend the class to handle numbers from 100 to 999.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number) { if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(345)); // Output: Three Hundred and Forty-Five } } 

3. How to convert large numbers (thousands) to words in C#?

   • Description: Extend the class to handle numbers in the thousands.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number) { if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100) : ""); if (number < 1000000) return ConvertToWords(number / 1000) + " Thousand" + (number % 1000 != 0 ? " " + ConvertToWords(number % 1000) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(1234)); // Output: One Thousand Two Hundred and Thirty-Four } } 

4. How to include support for millions in C# number-to-words conversion?

   • Description: Expand the class to handle numbers in the millions.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number) { if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100) : ""); if (number < 1000000) return ConvertToWords(number / 1000) + " Thousand" + (number % 1000 != 0 ? " " + ConvertToWords(number % 1000) : ""); if (number < 1000000000) return ConvertToWords(number / 1000000) + " Million" + (number % 1000000 != 0 ? " " + ConvertToWords(number % 1000000) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(1234567)); // Output: One Million Two Hundred and Thirty-Four Thousand Five Hundred and Sixty-Seven } } 

5. How to handle negative numbers in C# number-to-words conversion?

   • Description: Modify the class to handle negative numbers by adding "Negative" before the word representation.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number) { if (number == 0) return Units[0]; if (number < 0) return "Negative " + ConvertToWords(Math.Abs(number)); if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100) : ""); if (number < 1000000) return ConvertToWords(number / 1000) + " Thousand" + (number % 1000 != 0 ? " " + ConvertToWords(number % 1000) : ""); if (number < 1000000000) return ConvertToWords(number / 1000000) + " Million" + (number % 1000000 != 0 ? " " + ConvertToWords(number % 1000000) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(-1234)); // Output: Negative One Thousand Two Hundred and Thirty-Four } } 

6. How to handle decimal numbers in C# number-to-words conversion?

   • Description: Extend the class to convert decimal numbers, including the fractional part.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(decimal number) { var integerPart = (int)number; var fractionalPart = (int)((number - integerPart) * 100); var integerWords = ConvertToWords(integerPart); var fractionalWords = ConvertToWords(fractionalPart); return integerWords + " and " + fractionalWords + " Cents"; } private string ConvertToWords(int number) { if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100) : ""); if (number < 1000000) return ConvertToWords(number / 1000) + " Thousand" + (number % 1000 != 0 ? " " + ConvertToWords(number % 1000) : ""); if (number < 1000000000) return ConvertToWords(number / 1000000) + " Million" + (number % 1000000 != 0 ? " " + ConvertToWords(number % 1000000) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(1234.56m)); // Output: One Thousand Two Hundred and Thirty-Four and Fifty-Six Cents } } 

7. How to format the words for currency amounts in C#?

   • Description: Modify the class to format the words specifically for currency amounts.
   • Code:

     using System; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToCurrencyWords(decimal amount) { var integerPart = (int)amount; var fractionalPart = (int)((amount - integerPart) * 100); var integerWords = ConvertToWords(integerPart); var fractionalWords = ConvertToWords(fractionalPart); return integerWords + " Dollars and " + fractionalWords + " Cents"; } private string ConvertToWords(int number) { if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100) : ""); if (number < 1000000) return ConvertToWords(number / 1000) + " Thousand" + (number % 1000 != 0 ? " " + ConvertToWords(number % 1000) : ""); if (number < 1000000000) return ConvertToWords(number / 1000000) + " Million" + (number % 1000000 != 0 ? " " + ConvertToWords(number % 1000000) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToCurrencyWords(56789.99m)); // Output: Fifty-Six Thousand Seven Hundred and Eighty-Nine Dollars and Ninety-Nine Cents } } 

8. How to localize the number-to-words conversion in C#?

   • Description: Modify the class to support localization for different languages.
   • Code:

     using System; using System.Globalization; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number, CultureInfo culture) { // Example of localization based on culture if (culture.TwoLetterISOLanguageName == "es") // Spanish { // Implement Spanish number-to-words conversion return "Función de conversión en español no implementada"; } // Default to English if (number < 10) return Units[number]; if (number < 20) return Teens[number - 11]; if (number < 100) return Tens[number / 10 - 1] + (number % 10 != 0 ? "-" + Units[number % 10] : ""); if (number < 1000) return Units[number / 100] + " Hundred" + (number % 100 != 0 ? " and " + ConvertToWords(number % 100, culture) : ""); if (number < 1000000) return ConvertToWords(number / 1000, culture) + " Thousand" + (number % 1000 != 0 ? " " + ConvertToWords(number % 1000, culture) : ""); if (number < 1000000000) return ConvertToWords(number / 1000000, culture) + " Million" + (number % 1000000 != 0 ? " " + ConvertToWords(number % 1000000, culture) : ""); return "Number too large"; } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(1234, CultureInfo.InvariantCulture)); // Output: One Thousand Two Hundred and Thirty-Four } } 

9. How to optimize the number-to-words conversion for performance in C#?

   • Description: Optimize the class to handle large numbers more efficiently.
   • Code:

     using System; using System.Text; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(int number) { if (number == 0) return Units[0]; var sb = new StringBuilder(); if (number < 0) { sb.Append("Negative "); number = Math.Abs(number); } if (number >= 1000000) { sb.Append(ConvertToWords(number / 1000000) + " Million"); number %= 1000000; } if (number >= 1000) { sb.Append(ConvertToWords(number / 1000) + " Thousand"); number %= 1000; } if (number >= 100) { sb.Append(ConvertToWords(number / 100) + " Hundred"); number %= 100; } if (number >= 20) { sb.Append(Tens[number / 10 - 1]); number %= 10; if (number != 0) sb.Append("-" + Units[number]); } else if (number >= 10) { sb.Append(Teens[number - 11]); } else if (number > 0) { sb.Append(Units[number]); } return sb.ToString(); } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(1234567)); // Output: One Million Two Hundred Thirty-Four Thousand Five Hundred Sixty-Seven } } 

10. How to handle very large numbers (> 1 billion) in C# for number-to-words conversion?

    • Description: Extend the class to handle numbers larger than 1 billion.
    • Code:

      using System; using System.Text; public class NumberToWordsConverter { private static readonly string[] Units = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }; private static readonly string[] Teens = { "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen" }; private static readonly string[] Tens = { "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" }; public string ConvertToWords(long number) { if (number == 0) return Units[0]; var sb = new StringBuilder(); if (number < 0) { sb.Append("Negative "); number = Math.Abs(number); } if (number >= 1000000000000) { sb.Append(ConvertToWords(number / 1000000000000) + " Trillion"); number %= 1000000000000; } if (number >= 1000000000) { sb.Append(ConvertToWords(number / 1000000000) + " Billion"); number %= 1000000000; } if (number >= 1000000) { sb.Append(ConvertToWords(number / 1000000) + " Million"); number %= 1000000; } if (number >= 1000) { sb.Append(ConvertToWords(number / 1000) + " Thousand"); number %= 1000; } if (number >= 100) { sb.Append(ConvertToWords(number / 100) + " Hundred"); number %= 100; } if (number >= 20) { sb.Append(Tens[number / 10 - 1]); number %= 10; if (number != 0) sb.Append("-" + Units[number]); } else if (number >= 10) { sb.Append(Teens[number - 11]); } else if (number > 0) { sb.Append(Units[number]); } return sb.ToString(); } } class Program { static void Main() { var converter = new NumberToWordsConverter(); Console.WriteLine(converter.ConvertToWords(1234567890123)); // Output: One Trillion Two Hundred Thirty-Four Billion Five Hundred Sixty-Seven Million Eight Hundred Ninety Thousand One Hundred Twenty-Three } } 

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