I have a form that is used for cash purposes. In it, I have a total amount in numbers and the same total in letters. I want to convert the amount from numbers to written words. For example: if the total is $114.75, then it should be automatically converted to the text "One hundred and fourteen dollars and seventy five cents"

I have done it in the past using Excel, C#, and other programming languages using a pre-defined function that accepts amount, main currency, sub-currency and it would return the amount in letters as mentioned above.

Excel VBA function to convert amount from numbers to words (not mine, I found it online and used it in Excel and it works):

Function NumberToTextEN(ByVal MyNumber, MainCurrency As String, SubCurrency As String)
Dim Number1, Number2, Temp
Dim DecimalPlace, Count
ReDim Place(9) As String
Place(2) = " Thousand "
Place(3) = " Million "
Place(4) = " Billion "
Place(5) = " Trillion "
MyNumber = Trim(Str(MyNumber))
DecimalPlace = InStr(MyNumber, ".")
If DecimalPlace > 0 Then
Number2 = GetTens(Left(Mid(MyNumber, DecimalPlace + 1) & "00", 2))
MyNumber = Trim(Left(MyNumber, DecimalPlace - 1))
End If
Count = 1
Do While MyNumber <> ""
Temp = GetHundreds(Right(MyNumber, 3))
If Temp <> "" Then Number1 = Temp & Place(Count) & Number1
If Len(MyNumber) > 3 Then
MyNumber = Left(MyNumber, Len(MyNumber) - 3)
Else
MyNumber = ""
End If
Count = Count + 1
Loop
Select Case Number1
Case ""
Number1 = "No " & MainCurrency
Case Else
Number1 = Number1 & " " & MainCurrency
End Select
Select Case Number2
Case ""
Number2 = ""
Case Else
Number2 = " and " & Number2 & " " & SubCurrency
End Select
NumberToTextEN = Number1 & Number2
End Function
Function GetHundreds(ByVal MyNumber)
Dim Result As String
If Val(MyNumber) = 0 Then Exit Function
MyNumber = Right("000" & MyNumber, 3)
If Mid(MyNumber, 1, 1) <> "0" Then
Result = GetDigit(Mid(MyNumber, 1, 1)) & " Hundred "
End If
If Mid(MyNumber, 2, 1) <> "0" Then
Result = Result & GetTens(Mid(MyNumber, 2))
Else
Result = Result & GetDigit(Mid(MyNumber, 3))
End If
GetHundreds = Result
End Function
Function GetTens(TensText)
Dim Result As String
Result = ""
If Val(Left(TensText, 1)) = 1 Then
Select Case Val(TensText)
Case 10: Result = "Ten"
Case 11: Result = "Eleven"
Case 12: Result = "Twelve"
Case 13: Result = "Thirteen"
Case 14: Result = "Fourteen"
Case 15: Result = "Fifteen"
Case 16: Result = "Sixteen"
Case 17: Result = "Seventeen"
Case 18: Result = "Eighteen"
Case 19: Result = "Nineteen"
Case Else
End Select
Else
Select Case Val(Left(TensText, 1))
Case 2: Result = "Twenty "
Case 3: Result = "Thirty "
Case 4: Result = "Forty "
Case 5: Result = "Fifty "
Case 6: Result = "Sixty "
Case 7: Result = "Seventy "
Case 8: Result = "Eighty "
Case 9: Result = "Ninety "
Case Else
End Select
Result = Result & GetDigit(Right(TensText, 1))
End If
GetTens = Result
End Function
Function GetDigit(Digit)
Select Case Val(Digit)
Case 1: GetDigit = "One"
Case 2: GetDigit = "Two"
Case 3: GetDigit = "Three"
Case 4: GetDigit = "Four"
Case 5: GetDigit = "Five"
Case 6: GetDigit = "Six"
Case 7: GetDigit = "Seven"
Case 8: GetDigit = "Eight"
Case 9: GetDigit = "Nine"
Case Else: GetDigit = ""
End Select
End Function

What range of numbers do you need to cover? Do you have to handle decimal places? ... If limited range, eg at most hundreds w/ no decimals, then you could probably re-implement the equivalent of the above NumberToTextEN() function with a few XLSForm calculations. But for arbitrary numbers, you'd need some sort of loop (ala 'Do While MyNumber...') which isnt readily feasible with XPath calculations [although it could possibly be accomplished with a repeat, but it'd be messy I expect...]

I haven't tested it a lot so it might contain some bugs but at first glance, it seems ok: numbersToWords.xlsx (9.5 KB)
The form should support numbers <= 99 999 999.