Spell Numeric

public class SpellNumeric {
public static string IntegerToWords(long inputNum) {
long dig1,dig2,dig3,level = 0,lasttwo,threeDigits;
string retval = "";
string x = "";
string[] ones ={
" ",
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
"ten",
"eleven",
"twelve",
"thirteen",
"fourteen",
"fifteen",
"sixteen",
"seventeen",
"eighteen",
"nineteen"
  };
string[] tens ={
" ",
"ten",
"twenty",
"thirty",
"forty",
"fifty",
"sixty",
"seventy",
"eighty",
"ninety"
  };
string[] thou ={
"",
"thousand",
"million",
"billion",
"trillion",
"quadrillion",
"quintillion"
  };
bool isNegative = false;
if(inputNum < 0) {
isNegative = true;
inputNum *= -1;
}
if(inputNum == 0)
return ("zero");
string s = inputNum.ToString();
while(s.Length > 0) {
// Get the three rightmost characters
x = (s.Length < 3) ? s : s.Substring(s.Length - 3,3);
// Separate the three digits
threeDigits = long.Parse(x);
lasttwo = threeDigits % 100;
dig1 = threeDigits / 100;
dig2 = lasttwo / 10;
dig3 = (threeDigits % 10);
// append a "thousand" where appropriate
if(level > 0 && dig1 + dig2 + dig3 > 0) {
retval = thou[level] + " " + retval;
retval = retval.Trim();
}
// check that the last two digits is not a zero
if(lasttwo > 0) {
if(lasttwo < 20) // if less than 20, use "ones" only
retval = ones[lasttwo] + " " + retval;
else // otherwise, use both "tens" and "ones" array
retval = tens[dig2] + " " + ones[dig3] + " " + retval;
}
// if a hundreds part is there, translate it
if(dig1 > 0)
retval = ones[dig1] + " hundred " + retval;
s = (s.Length - 3) > 0 ? s.Substring(0,s.Length - 3) : "";
level++;
}
while(retval.IndexOf("  ") > 0)
retval = retval.Replace("  "," ");
retval = retval.Trim();
if(isNegative)
retval = "negative " + retval;
return (retval);
}
public static string SpellDecimal(decimal number) {
string[] digit =
{
"", "one", "two", "three", "four", "five", "six",
"seven", "eight", "nine", "ten", "eleven", "twelve",
"thirteen", "fourteen", "fifteen", "sixteen",
"seventeen", "eighteen", "nineteen"
};
string[] baseten =
{
"", "", "twenty", "thirty", "fourty", "fifty",
"sixty", "seventy", "eighty", "ninety"
};
string[] expo =
{
"", "thousand", "million", "billion", "trillion",
"quadrillion", "quintillion"
};
StringBuilder sb = new StringBuilder();
int thousands = 0;
decimal power = 1;
if(number < 0) {
sb.Append("minus ");
number = -number;
}
decimal n = Decimal.Truncate(number);
decimal cents = Decimal.Truncate((number - n) * 100);
if(n == Decimal.Zero)
sb.Append("zero");
for(decimal i = n;i >= 1000;i /= 1000) {
power *= 1000;
thousands++;
}
bool sep = false;
for(decimal i = n;thousands >= 0;i %= power,thousands--,power /= 1000) {
int j = (int)(i / power);
int k = j % 100;
int hundreds = j / 100;
int tens = j % 100 / 10;
int ones = j % 10;
if(j == 0)
continue;
if(hundreds > 0) {
if(sep)
sb.Append(", ");
sb.Append(digit[hundreds]);
sb.Append(" hundred");
sep = true;
}
if(k != 0) {
if(sep) {
sb.Append(" and ");
sep = false;
}
if(k < 20)
sb.Append(digit[k]);
else {
sb.Append(baseten[tens]);
if(ones > 0) {
sb.Append("-");
sb.Append(digit[ones]);
}
}
}
if(thousands > 0) {
sb.Append(" ");
sb.Append(expo[thousands]);
sep = true;
}
}
sb.Append(" and ");
if(cents < 10)
sb.Append("0");
sb.Append(cents);
sb.Append("/100");
return sb.ToString();
}
}