How Can I Convert Numbers to Words in C#?

Number to text conversion in C#

Converting numeric values ​​to their corresponding literal form is a common task in programming. This conversion is particularly useful in a variety of scenarios, such as generating invoices, automating voice announcements, or processing voice commands.

One approach is to use a combination of modular arithmetic, conditional statements, and predefined arrays or dictionaries to map numbers and groups of numbers to their corresponding literal representations. Here is an example implemented in C#:

<code class="language-csharp">public static string NumberToWords(int number)
{
    // 处理零和负数的特殊情况
    if (number == 0)
        return "zero";
    else if (number < 0)
        return "minus " + NumberToWords(-number);

    string words = "";

    // 处理百万
    if (number >= 1000000)
    {
        words += NumberToWords(number / 1000000) + " million ";
        number %= 1000000;
    }

    // 处理千位
    if (number >= 1000)
    {
        words += NumberToWords(number / 1000) + " thousand ";
        number %= 1000;
    }

    // 处理百位
    if (number >= 100)
    {
        words += NumberToWords(number / 100) + " hundred ";
        number %= 100;
    }

    // 处理剩余数字
    if (number > 0)
    {
        if (words != "")
            words += "and ";

        string[] units = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
        string[] tens = { "zero", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety" };

        if (number < 20)
            words += units[number];
        else
        {
            words += tens[number / 10];
            if (number % 10 > 0)
                words += "-" + units[number % 10];
        }
    }

    return words.Trim();
}</code>

To use this method, simply provide an integer as a parameter and it will return the literal equivalent of that number. For example, NumberToWords(123) will return "one hundred and twenty-three" and NumberToWords(-543) will return "minus five hundred and forty-three". The code has been improved to handle the use of the connective "and" and clearer handling of negative numbers and zero. Trim() method is used to remove extra spaces.

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