Answer / narendran

public class Convertor
{
#region Dec - Arrays
private string[] arrOnes = new string[] {
"Zero",
"One",
"Two",
"Three",
"Four",
"Five",
"Six",
"Seven",
"Eight",
"Nine"
};
private string[] arrMisc = new string[] {
"",
"Eleven",
"Twelve",
"Thirteen",
"Fourteen",
"Fifteen",
"Sixteen",
"Seventeen",
"Eighteen",
"Nineteen",
};
private string[] arrTens = new string[] {
"",
"Ten",
"Twenty",
"Thirty",
"Forty",
"Fifty",
"Sixty",
"Seventy",
"Eighty",
"Ninety",
};

#endregion

#region Constants
private const string HUNDRED_TEXT = " Hundred";
private const string THOUSAND_TEXT = " Thousand";
private const string LAKH_TEXT = " Lakh";
private const string AND_TEXT = " and ";
private const string POINT_TEXT = " point ";
private const string TOO_HIGH_TEXT = "Too high value";

private const int ONE = 1;
private const int TEN = 2;
private const int HUNDRED = 3;
private const int THOUSAND = 4;
private const int TENTHOUSAND = 5;
private const int LAKH = 6;
private const int TENLAKH = 7;

private const int MAX_ALLOWED_LENGTH = TENLAKH;

public const int ERR_TOOLENGTH = -1;
public const int ERR_INPUT = -2;
public const int RET_SUCCESS = 0;
#endregion

public int ConvertNumberToText(String sNumber, out
string sResult)
{
sResult = "";
string[] str = sNumber.Split(new char[] { '.' });
string sStrAfterDecimal = str.Length > 1 ?
str[1] : "";
string sStrBeforeDecimal = str.Length >= 1 ?
str[0] : "";

if (sStrBeforeDecimal.Length > MAX_ALLOWED_LENGTH)
{
sResult = TOO_HIGH_TEXT;
return ERR_TOOLENGTH;
}

if (GetNuumberText(sStrBeforeDecimal, false, ref
sResult) == RET_SUCCESS)
{
if (sStrAfterDecimal != "")
{
sResult += POINT_TEXT;
if (GetNuumberText(sStrAfterDecimal,
true, ref sResult) != RET_SUCCESS)
{
sResult = "Error while computing..";
return ERR_INPUT;
}
}
return RET_SUCCESS;
}
else
{
sResult = "Error while computing..";
return ERR_INPUT;
}
}

private int GetNuumberText(string str, bool
isAfterDecimal, ref string retStr)
{
bool addAndString = false;
try
{
if (isAfterDecimal && str.Length >= 1)
{
for (int i = 0; i < str.Length; i++)
retStr +=
arrOnes[int.Parse(str[i].ToString())] + " ";
retStr = retStr.Remove(retStr.Length - 1);
}
else
{
while (str.Length > 0)
{
switch (str.Length)
{
case ONE:
retStr +=
arrOnes[int.Parse(str[0].ToString())];
str = "";
break;
case TEN:
{
string temp =
GetTwoDigitString(str);
if (temp != "")
retStr +=
addAndString ? AND_TEXT + temp : temp;
str = "";
}
break;
case HUNDRED:
if (str[0] != '0')
retStr +=
string.Format("{0}{1}",
arrOnes[int.Parse(str[0].ToString())], HUNDRED_TEXT);

if (str.Substring(1) != "00")
addAndString = true;
str = str.Remove(0, 1);
break;
case THOUSAND:
retStr +=
string.Format("{0}{1} ",
arrOnes[int.Parse(str[0].ToString())], THOUSAND_TEXT);
str = str.Remove(0, 1);
break;
case TENTHOUSAND:
{
string temp =
GetTwoDigitString(str.Substring(0, 2));
if (temp != "")
retStr +=
string.Format("{0}{1} ", temp, THOUSAND_TEXT);
str = str.Remove(0, 2);
}
break;
case LAKH:
retStr +=
string.Format("{0}{1} ",
arrOnes[int.Parse(str[0].ToString())], LAKH_TEXT);
str = str.Remove(0, 1);
break;
case TENLAKH:
{
string temp =
GetTwoDigitString(str.Substring(0, 2));
if (temp != "")
retStr +=
string.Format("{0}{1} ", temp, LAKH_TEXT);
str = str.Remove(0, 2);
}
break;
default:
break;
}
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return ERR_INPUT;
}
return RET_SUCCESS;
}

private string GetTwoDigitString(string str)
{
if (str == "00") return "";
string retString = "";
if (str[1] == '0')
retString +=
arrTens[int.Parse(str[0].ToString())];
else if (str[0] == '1')
retString +=
arrMisc[int.Parse(str[1].ToString())];
else
{
retString +=
arrTens[int.Parse(str[0].ToString())];
retString +=
arrOnes[int.Parse(str[1].ToString())];
}
return retString;
}
}

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