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数字转化为英文字符串 递归算法即可

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/// <summary>
/// 数字转化为英文字符串 递归算法即可
/// </summary>
/// <param name="number"></param>
/// <returns></returns>
static string NumberToEnglishString(int number)
{
    if (number < 0) //暂不考虑负数
    {
        return "";
    }
    if (number < 20) //0到19
    {
        switch (number)
        {
            case 0:
                return "zero";
            case 1:
                return "one";
            case 2:
                return "two";
            case 3:
                return "three";
            case 4:
                return "four";
            case 5:
                return "five";
            case 6:
                return "sex";
            case 7:
                return "seven";
            case 8:
                return "eight";
            case 9:
                return "nine";
            case 10:
                return "ten";
            case 11:
                return "eleven";
            case 12:
                return "twelve";
            case 13:
                return "thirteen";
            case 14:
                return "fourteen";
            case 15:
                return "fifteen";
            case 16:
                return "sixteen";
            case 17:
                return "seventeen";
            case 18:
                return "eighteen";
            case 19:
                return "nineteen";
            default:
                return "";
        }
    }
    if (number < 100) //20到99
    {
        if (number % 10 == 0) //20,30,40,...90的输出
        {
            switch (number)
            {
                case 20:
                    return "twenty";
                case 30:
                    return "thirty";
                case 40:
                    return "forty";
                case 50:
                    return "fifty";
                case 60:
                    return "sixty";
                case 70:
                    return "seventy";
                case 80:
                    return "eighty";
                case 90:
                    return "ninety";
                default:
                    return "";
            }
        }
        else //21.22,....99 思路：26=20+6
        {
            return string.Format("{0} {1}", NumberToEnglishString(10 * (number / 10)),
                NumberToEnglishString(number % 10));
        }
    }
    if (number < 1000) //100到999  百级
    {
        if (number % 100 == 0)
        {
            return string.Format("{0} hundred", NumberToEnglishString(number / 100));
        }
        else
        {
            return string.Format("{0} hundred and {1}", NumberToEnglishString(number / 100),
                NumberToEnglishString(number % 100));
        }
    }
    if (number < 1000000) //1000到999999 千级
    {
        if (number % 1000 == 0)
        {
            return string.Format("{0} thousand", NumberToEnglishString(number / 1000));
        }
        else
        {
            return string.Format("{0} thousand and {1}", NumberToEnglishString(number / 1000),
                NumberToEnglishString(number % 1000));
        }
    }
    if (number < 1000000000) //1000 000到999 999 999 百万级
    {
        if (number % 1000 == 0)
        {
            return string.Format("{0} million", NumberToEnglishString(number / 1000000));
        }
        else
        {
            return string.Format("{0} million and {1}", NumberToEnglishString(number / 1000000),
                NumberToEnglishString(number % 1000000));
        }
    }
    if (number <= int.MaxValue) //十亿 级
    {
        if (number % 1000000000 == 0)
        {
            return string.Format("{0} billion", NumberToEnglishString(number / 1000000000));
        }
        else
        {
            return string.Format("{0} billion and {1}", NumberToEnglishString(number / 1000000000),
                NumberToEnglishString(number % 1000000000));
        }
    }
    return "";
}

　　

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