Question

Palindrome ~Excel VBA Macros

Asked by: tonishak

This is in Excel VBA Macros.
How do I create a funtion that will receive a single parameter of type string, and it should use a message box to indicate whether or not the string is a palindrome.
 ~A palindrome is a word, phrase, number, or other sequence of units that can be read the same way in either direction. For example Xanax.

In other words the function should check whether or not the inputted string is the same frontwards and backwards and say either "string" is a Palindrome or "string" is not a palindrome.

Input is restricted to upper or lower case letters,; numbers, 0 - 9; blank spaces, and periods, commas, question marks, and exclamation points.

Function palindrome()
Dim x As String
 
If x = Cells(16, 1) Then
MsgBox x & " is a Palindrome."
 
Else: x = Cells(16, 1)
MsgBox x & " is not a Palindrom."
 
End If
 
End Function

                                  
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Asked On
2009-10-10 at 12:54:56ID24802011
Topics

Microsoft Excel Spreadsheet Software

,

VB Objects

,

VB Script

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: barryhoudiniPosted on 2009-10-10 at 13:30:23ID: 25543683

Try here

regards, barry

 

by: chris_bottomleyPosted on 2009-10-10 at 13:34:04ID: 25543697

Hello tonishak,

Dunno about BArrys solution as i've just tested this so i'll post anyway.

Regards,

chris_bottomley

Function isPalindrome(str) As Boolean
Dim ch As Integer 
    isPalindrome = True
    For ch = 1 To Len(str) / 2
        If Mid(str, ch, 1) <> Mid(str, Len(str) - ch + 1, 1) Then isPalindrome = False
    Next
    
End Function

                                              
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by: chris_bottomleyPosted on 2009-10-10 at 13:39:22ID: 25543718

tonishak,

Just looked at Barrys submission, it introduced a method I haven't come across before and is so much better!  I have adapted it to a boolean response for information.

And Barry, does this mean you are now doing VBA solutions ;o)

chris_bottomley

Function isPalindrome(str As String) As Boolean
    
    isPalindrome = CBool(str = StrReverse(str)) 
End Function

                                              
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by: barryhoudiniPosted on 2009-10-10 at 13:49:22ID: 25543755

And Barry, does this mean you are now doing VBA solutions ;o)

No, Chris.....I just know a man who can......

barry

 

by: tonishakPosted on 2009-10-10 at 13:58:37ID: 25543781

Hey All,
Thanks everyone for all of your answers. I'm somewhat compiling them all together, but I'm still not getting the right answer. I have to enter the word in a cell reference, VBA reads the cell and through a message box tells me whether it is or is not a Palindrome. Can you please look at my vode and tell me where I'm going wrong.

Thank you,
 Tonisha

Function Palindrome()
    Dim y As String
    Dim x As String
    x = cells(16, 2)
    y = StrReverse(x)
    If x = y Then
          MsgBox y & " is a Palindrome." 
    Else: y = x
         MsgBox y & " is not a Palindrome." 
    End If
End Function

                                              
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by: ahammarPosted on 2009-10-10 at 14:00:14ID: 25543786

Here's a longer version but it works good...lol
It returns the entire sentence that the asker asked forin this format: "string" is a Palindrome or "string" is not a palindrome

although the previous codes could be edited to do the same.

Here's the code and a sample working file...

:-)
Albert

Function isPalindrome(strString As String) As String
 
Dim strBackward As String
Dim lenString As Integer
Dim n As Integer
Dim ForwardString As String
ForwardString = strString
 
    lenString = Len(ForwardString)
    
    For n = lenString To 1 Step -1
        strBackward = strBackward & Mid(ForwardString, n, 1)
    Next n
    If LCase(strBackward) = LCase(ForwardString) Then
        isPalindrome = ForwardString & " is palindrome"
    Else
        isPalindrome = ForwardString & " is not palindrome"
    End If
 
End Function
                                              
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by: barryhoudiniPosted on 2009-10-10 at 14:04:47ID: 25543800

Try this code.....

regards, barry

Sub Palindrome()
Dim y As String
    Dim x As String
    x = Cells(16, 2)
    y = StrReverse(x)
    If x = y Then
          MsgBox y & " is a Palindrome."
    Else: y = x
         MsgBox y & " is not a Palindrome."
    End If
End Sub

                                              
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by: ahammarPosted on 2009-10-10 at 14:05:13ID: 25543804

If you have a look at my workbook you can jsut change the msgbox in the test sub to this:

MsgBox isPalindrome(Cells(16, 2))

and it will read what is in that cell..my macro also ignores upper and lower case letters so they can be mixed and it will still work...

:-)
Albert

 

by: tonishakPosted on 2009-10-10 at 14:18:02ID: 31639682

Great job! I really aprreciate your answer.

 

by: ahammarPosted on 2009-10-10 at 14:29:17ID: 25543896

Thanks for the points and the grade!  I'm glad it worked for you...You can come back to this thread anytime if you have any questions about any of this...

:-)
Albert

20120131-EE-VQP-002

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