Number to Short string

gistfile1.txt

public static string NumToShortStr(this double num)
    {
        string prefix = string.Empty;
        if (num < 0)
            prefix = "-";
        num = Math.Abs(num);
        if (num >= 1000000000000D)
            return prefix + (num / 1000000000000D).ToString("0.#").Replace(',', '.') + "T";
        if (num >= 1000000000D)
            return prefix + (num / 1000000000D).ToString("0.#").Replace(',', '.') + "B";
        if (num >= 1000000D)
            return prefix + (num / 1000000D).ToString("0.#").Replace(',', '.') + "M";
        if (num >= 1000D)
            return prefix + (num / 1000D).ToString("0.#").Replace(',', '.') + "K";
        if (num < 1D)
            return prefix + num.ToString("0.##").Replace(',', '.');
        return prefix + num.ToString("0.#").Replace(',', '.');
    }

    public static string NumToShortStr(this int num)
    {
        return NumToShortStr((double)num);
    }

    public static string NumToShortStr(this long num)
    {
        return NumToShortStr((double)num);
    }

    public static string NumToShortStr(this float num)
    {
        return NumToShortStr((double)num);
    }