C# || How To Convert Integer To English Words Using C#

November 01, 2024 admin No comments

The following is a module with functions which demonstrates how to convert integer to english words using C#.

1. Integer to English Words – Problem Statement

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"

2. Integer to English Words – Solution

The following is a solution which demonstrates how to convert integer to english words.





		
		
			2. Integer to English Words - Solution
			
C#
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Nov 1, 2024
//    Taken From: http://programmingnotes.org/
//    File:  Solution.cs
//    Description: Demonstrates how to convert integer to english word
// ============================================================================
public class NumberWord {
    public int Value { get; }
    public string Word { get; }

    public NumberWord(int value, string word) {
        Value = value;
        Word = word;
    }
}

public class Solution {
    // List to store words for numbers
    private static readonly List<NumberWord> numberToWordsList = new List<NumberWord> {
        new NumberWord(1000000000, "Billion"),
        new NumberWord(1000000, "Million"),
        new NumberWord(1000, "Thousand"),
        new NumberWord(100, "Hundred"),
        new NumberWord(90, "Ninety"),
        new NumberWord(80, "Eighty"),
        new NumberWord(70, "Seventy"),
        new NumberWord(60, "Sixty"),
        new NumberWord(50, "Fifty"),
        new NumberWord(40, "Forty"),
        new NumberWord(30, "Thirty"),
        new NumberWord(20, "Twenty"),
        new NumberWord(19, "Nineteen"),
        new NumberWord(18, "Eighteen"),
        new NumberWord(17, "Seventeen"),
        new NumberWord(16, "Sixteen"),
        new NumberWord(15, "Fifteen"),
        new NumberWord(14, "Fourteen"),
        new NumberWord(13, "Thirteen"),
        new NumberWord(12, "Twelve"),
        new NumberWord(11, "Eleven"),
        new NumberWord(10, "Ten"),
        new NumberWord(9, "Nine"),
        new NumberWord(8, "Eight"),
        new NumberWord(7, "Seven"),
        new NumberWord(6, "Six"),
        new NumberWord(5, "Five"),
        new NumberWord(4, "Four"),
        new NumberWord(3, "Three"),
        new NumberWord(2, "Two"),
        new NumberWord(1, "One")
    };

    public string NumberToWords(int num) {
        if (num == 0) {
            return "Zero";
        }

        foreach (var nw in numberToWordsList) {
            // Check if the number is greater than or equal to the current unit
            if (num >= nw.Value) {
                // Convert the quotient to words if the current unit is 100 or greater
                string prefix = (num >= 100) ? NumberToWords(num / nw.Value) + " " : "";

                // Get the word for the current unit
                string unit = nw.Word;

                // Convert the remainder to words if it's not zero
                string suffix = (num % nw.Value == 0) ? "" : " " + NumberToWords(num % nw.Value);

                return prefix + unit + suffix;
            }
        }

        return "";
    }
}// http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Nov 1, 2024
//    Taken From: http://programmingnotes.org/
//    File:  Solution.cs
//    Description: Demonstrates how to convert integer to english word
// ============================================================================
public class NumberWord {
    public int Value { get; }
    public string Word { get; }
 
    public NumberWord(int value, string word) {
        Value = value;
        Word = word;
    }
}
 
public class Solution {
    // List to store words for numbers
    private static readonly List<NumberWord> numberToWordsList = new List<NumberWord> {
        new NumberWord(1000000000, "Billion"),
        new NumberWord(1000000, "Million"),
        new NumberWord(1000, "Thousand"),
        new NumberWord(100, "Hundred"),
        new NumberWord(90, "Ninety"),
        new NumberWord(80, "Eighty"),
        new NumberWord(70, "Seventy"),
        new NumberWord(60, "Sixty"),
        new NumberWord(50, "Fifty"),
        new NumberWord(40, "Forty"),
        new NumberWord(30, "Thirty"),
        new NumberWord(20, "Twenty"),
        new NumberWord(19, "Nineteen"),
        new NumberWord(18, "Eighteen"),
        new NumberWord(17, "Seventeen"),
        new NumberWord(16, "Sixteen"),
        new NumberWord(15, "Fifteen"),
        new NumberWord(14, "Fourteen"),
        new NumberWord(13, "Thirteen"),
        new NumberWord(12, "Twelve"),
        new NumberWord(11, "Eleven"),
        new NumberWord(10, "Ten"),
        new NumberWord(9, "Nine"),
        new NumberWord(8, "Eight"),
        new NumberWord(7, "Seven"),
        new NumberWord(6, "Six"),
        new NumberWord(5, "Five"),
        new NumberWord(4, "Four"),
        new NumberWord(3, "Three"),
        new NumberWord(2, "Two"),
        new NumberWord(1, "One")
    };
 
    public string NumberToWords(int num) {
        if (num == 0) {
            return "Zero";
        }
 
        foreach (var nw in numberToWordsList) {
            // Check if the number is greater than or equal to the current unit
            if (num >= nw.Value) {
                // Convert the quotient to words if the current unit is 100 or greater
                string prefix = (num >= 100) ? NumberToWords(num / nw.Value) + " " : "";
 
                // Get the word for the current unit
                string unit = nw.Word;
 
                // Convert the remainder to words if it's not zero
                string suffix = (num % nw.Value == 0) ? "" : " " + NumberToWords(num % nw.Value);
 
                return prefix + unit + suffix;
            }
        }
 
        return "";
    }
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output for the example cases:

"One Hundred Twenty Three" "Twelve Thousand Three Hundred Forty Five" "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"

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Posted in: C#, Console Tags: c-sharp, leetcode

C# || How To Convert Integer To English Words Using C#

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