public string ConvertNumbertoWords(int number)
{
if (number == 0)
return "ZERO";
if (number < 0)
return "minus " + ConvertNumbertoWords(Math.Abs(number));
string words = "";
if ((number/1000000) > 0)
{
words +=
ConvertNumbertoWords(number/1000000) + "
MILLION ";
number %= 1000000;
}
if ((number/1000) > 0)
{
words += ConvertNumbertoWords(number/1000)
+ " THOUSAND ";
number %= 1000;
}
if ((number/100) > 0)
{
words +=
ConvertNumbertoWords(number/100) + "
HUNDRED ";
number %= 100;
}
if (number > 0)
{
if (words != "")
words += "AND ";
var unitsMap = new[]
{
"ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN",
"TWELVE", "THIRTEEN", "FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN"
};
var tensMap = new[]
{"ZERO", "TEN", "TWENTY", "THIRTY", "FORTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY", "NINETY"};
if (number < 20)
words += unitsMap[number];
else
{
words += tensMap[number/10];
if ((number%10) > 0)
words += " " +
unitsMap[number%10];
}
}
return words;
}