by Matt Marooney (1 Submission)
Category: String Manipulation
Compatability: Visual Basic 3.0
Difficulty: Advanced
Date Added: Wed 3rd February 2021
Rating: 
(4 Votes)
Converts two character strings of A-Z or AA-ZZ into integer equivalents. Example: User inputs "A", returns 1, user inputs AE, returns 110 and so on.
Inputs
Two character string variable is passed to this function
Code Returns
Returns Integer equiv of the string
VBcoders' User inputs a string of 2 characters, uppercase or lowercase.
'Function returns the combined integer value of the string (ex. A = 1, B=2...
'AA = 27, AB = 28...ect.)
Function GetNumber(UserInput As String) As Integer
Dim UpperCaseArray(1, 26) As String
Dim LowerCaseArray(1, 26) As String
Dim UpperCaseString As String
Dim LowerCaseString As String
Dim FirstNum As Integer
Dim SecondNum As Integer
UpperCaseString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
LowerCaseString = "abcdefghijklmnopqrstuvwxyz"
'Assign string characters to array cells
For x = 1 To Len(UpperCaseString)
UpperCaseArray(1, x) = Mid(UpperCaseString, x, 1)
LowerCaseArray(1, x) = Mid(LowerCaseString, x, 1)
Next x
If Len(UserInput) = 1 Then ' check for single character input
For y = 1 To Len(UpperCaseString)
'If the input from the user is A-Z or a-z the Function returns 1-26
If Mid(UserInput, 1, 1) = UpperCaseArray(1, y) Then
GetNumber = y
End If
If Mid(UserInput, 1, 1) = LowerCaseArray(1, y) Then
GetNumber = y
End If
Next y
Else
'If User Input has two characters...
'Check first character...store numerical value in FirstNum
For z = 1 To Len(UpperCaseString)
If Mid(UserInput, 1, 1) = UpperCaseArray(1, z) Then
FirstNum = z
End If
If Mid(UserInput, 1, 1) = LowerCaseArray(1, z) Then
FirstNum = z
End If
Next z
'Check second character
'Store numerical value in SecondNum
For w = 1 To Len(UpperCaseString)
If Mid(UserInput, 2, 1) = UpperCaseArray(1, w) Then
SecondNum = w
End If
If Mid(UserInput, 2, 1) = LowerCaseArray(1, w) Then
SecondNum = w
End If
Next w
'Algorithm for adding the values for the first character to that
'of the second character to determine which set of 26 the user
'selected.
'i.e. if user enters "AA" then this loop determines that the first
'character is equal to one. the loop returns 26 + 1, or 27. So, the
'value of user input of "AA" is 27. And so on and so forth...
'If the value entered is "BA", the algorithm returns 52 + 1, or 53
'This loop will return the values for up to "IZ"
'To extend to ZZ, merely change number of iterations in this loop to 26
For V = 1 To 9
If FirstNum = V Then
GetNumber = ((26 * V) + SecondNum)
End If
Next V
End If
End Function