Here is a function which can convert a number logically upto 9,99,99,99,999 but restricted by Integer.MaxValue that is 2,14,74,83,647.
Private dict As New Dictionary(Of Integer, String)
Private amount(,) As Object = {{0, "Zero"}, {1, "One"}, {2, "Two"}, {3, "Three"}, {4, "Four"}, {5, "Five"}, {6, "Six"}, {7, "Seven"}, {8, "Eight"}, {9, "Nine"}, {10, "Ten"}, {11, "Eleven"}, {12, "Twelve"}, {13, "Thirteen"}, {14, "Fourteen"}, {15, "Fifteen"}, {16, "Sixteen"}, {17, "Seventeen"}, {18, "Eighteen"}, {19, "Nineteen"}, {20, "Twenty"}, {30, "Thirty"}, {40, "Forty"}, {50, "Fifty"}, {60, "Sixty"}, {70, "Seventy"}, {80, "Eighty"}, {90, "Ninety"}, {100, "Hundred"}, {1000, "Thousand"}, {100000, "Lakh"}, {10000000, "Crore"}, {1000000000, "Arab"}}
Public Function NumberToWords(ByVal Number As Decimal) As String
If dict.Count = 0 Then
For i As Integer = 0 To UBound(amount, 1)
dict.Add(amount(i, 0), amount(i, 1))
Next
End If
Dim InWordsFull As String = ""
Dim InWordsDec As String = ""
Dim DecimalPart As Decimal = Number - Math.Floor(Number)
Dim FullPart As Integer = Number - DecimalPart
If DecimalPart <> 0 Then
DecimalPart = CDec(DecimalPart.ToString.Replace("0.", ""))
End If
While FullPart <> 0
For i As Integer = UBound(amount, 1) To 0 Step -1
If amount(i, 0) <= FullPart Then
Dim temp As Integer = Math.Floor(FullPart / amount(i, 0))
InWordsFull &= IIf(i > 27, convert(temp) & " ", "") & dict(amount(i, 0)) & " "
FullPart -= temp * amount(i, 0)
Exit For
End If
Next
End While
While DecimalPart <> 0
For i As Integer = UBound(amount, 1) To 0 Step -1
If amount(i, 0) <= DecimalPart Then
Dim temp As Integer = Math.Floor(DecimalPart / amount(i, 0))
InWordsDec &= IIf(i > 27, convert(temp) & " ", "") & dict(amount(i, 0)) & " "
DecimalPart -= temp * amount(i, 0)
Exit For
End If
Next
End While
Return InWordsFull.Trim & IIf(InWordsDec <> "", " Point " & InWordsDec.Trim, "")
End Function
Private Function convert(ByVal number As Integer) As String
Dim InWords As String = ""
If dict.ContainsKey(number) Then
InWords = dict(number)
Else
While number <> 0
For i As Integer = UBound(amount, 1) To 0 Step -1
If amount(i, 0) <= number Then
Dim temp As Integer = Math.Floor(number / amount(i, 0))
InWords &= IIf(i > 27, dict(temp) & " ", "") & dict(amount(i, 0)) & " "
number -= temp * amount(i, 0)
Exit For
End If
Next
End While
End If
Return InWords.Trim
End Function
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