How to Convert Words to Numbers in C#

Here, I have described how to convert words to number values.

Introduction 

 

In this blog, I have described how to convert words to numeric values.

 

For example:

Input = Three Thousand Five Hundred Sixty Two

Output = 3562

 

The function is named "ConvertToNumbers" and accepts a parameter of type string and returns a number value containing the words in number.

class WordsToNumbers
{
    private static Dictionary<string, long> numberTable = new Dictionary<string, long>{
        {"zero",0},{"one",1},{"two",2},{"three",3},{"four",4},{"five",5},{"six",6},
        {"seven",7},{"eight",8},{"nine",9},{"ten",10},{"eleven",11},{"twelve",12},
        {"thirteen",13},{"fourteen",14},{"fifteen",15},{"sixteen",16},{"seventeen",17},
        {"eighteen",18},{"nineteen",19},{"twenty",20},{"thirty",30},{"forty",40},
        {"fifty",50},{"sixty",60},{"seventy",70},{"eighty",80},{"ninety",90},
        {"hundred",100},{"thousand",1000},{"lakh",100000},{"million",1000000},
        {"billion",1000000000},{"trillion",1000000000000},{"quadrillion",1000000000000000},
        {"quintillion",1000000000000000000}
    };

    public static long ConvertToNumbers(string numberString)
    {
        var numbers = Regex.Matches(numberString, @"\w+").Cast<Match>()
                .Select(m => m.Value.ToLowerInvariant())
                .Where(v => numberTable.ContainsKey(v))
                .Select(v => numberTable[v]);
        long acc = 0, total = 0L;
        foreach (var n in numbers)
        {
            if (n >= 1000)
            {
                total += acc * n;
                acc = 0;
            }
            else if (n >= 100)
            {
                acc *= n;
            }
            else acc += n;
        }
        return (total + acc) * (numberString.StartsWith("minus",
                StringComparison.InvariantCultureIgnoreCase) ? -1 : 1);
    }
}

 

 Now, call the ConvertToNumbers method.

static void Main(string[] args)
{
    try
    {
        string strNumber = "Three Thsound Five Hundred Sixty Two";
        string rtnNumber = ConvertToNumbers(strNumber);

        Console.WriteLine("Number is {0}", rtnNumber);
        Console.ReadKey();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
}

 I hope this is useful for all readers. Happy Coding!