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#1
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Ensure cell contains a number
I need a function I can call in code that will return true if the current
cell contents contains either a number or a formula that evaluates to a number. Can someone throw me a bone? Thanks in advance! |
#2
Posted to microsoft.public.excel.programming
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Ensure cell contains a number
Sub ifnumber()
For Each c In Range("j1:j8") If Len(Application.Trim(c)) 0 And _ IsNumeric(c) Then MsgBox c.Row Next c End Sub -- Don Guillett Microsoft MVP Excel SalesAid Software "xp" wrote in message ... I need a function I can call in code that will return true if the current cell contents contains either a number or a formula that evaluates to a number. Can someone throw me a bone? Thanks in advance! |
#3
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Ensure cell contains a number
There are a couple of possibilities for you to consider. First, you can call
out to the worksheet's ISNUMBER function. If CV is a variable containing the cell value, then WorksheetFunction.IsNumber(CV) will do what you asked. You weren't clear about it, but if the cell is formatted as TEXT, this function will return False even if that text value is a "number"; in other words, the above function will return True only for *real* numeric values. Another possibility which does not have this restriction (real numbers and text that looks like numbers will both evaluate as True) uses the built in VBA IsNumeric function. You would call that directly. Again, if CV is a variable containing the cell value, then IsNumeric(CV) will return True if CV is, or can be interpreted as, a number; otherwise it returns False. HOWEVER, if might also return True for things you would not consider as being a number. Here is a previous posting of mine which explains the problem and gives some alternative methods of handling it (real and text numbers being considered as numbers)... I usually try and steer people away from using IsNumeric to "proof" supposedly numeric text. Consider this (also see note below): ReturnValue = IsNumeric("($1,23,,3.4,,,5,,E67$)") Most people would not expect THAT to return True. IsNumeric has some "flaws" in what it considers a proper number and what most programmers are looking for. I had a short tip published by Pinnacle Publishing in their Visual Basic Developer magazine that covered some of these flaws. Originally, the tip was free to view but is now viewable only by subscribers.. Basically, it said that IsNumeric returned True for things like -- currency symbols being located in front or in back of the number as shown in my example (also applies to plus, minus and blanks too); numbers surrounded by parentheses as shown in my example (some people use these to mark negative numbers); numbers containing any number of commas before a decimal point as shown in my example; numbers in scientific notation (a number followed by an upper or lower case "D" or "E", followed by a number equal to or less than 305 -- the maximum power of 10 in VB); and Octal/Hexadecimal numbers (&H for Hexadecimal, &O or just & in front of the number for Octal). NOTE: ====== In the above example and in the referenced tip, I refer to $ signs and commas and dots -- these were meant to refer to your currency, thousands separator and decimal point symbols as defined in your local settings -- substitute your local regional symbols for these if appropriate. As for your question about checking numbers, here are two functions that I have posted in the past for similar questions..... one is for digits only and the other is for "regular" numbers: Function IsDigitsOnly(Value As String) As Boolean IsDigitsOnly = Len(Value) 0 And _ Not Value Like "*[!0-9]*" End Function Function IsNumber(ByVal Value As String) As Boolean ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9.]*" And _ Not Value Like "*.*.*" And _ Len(Value) 0 And Value < "." And _ Value < vbNullString End Function Here are revisions to the above functions that deal with the local settings for decimal points (and thousand's separators) that are different than used in the US (this code works in the US too, of course). Function IsNumber(ByVal Value As String) As Boolean Dim DP As String ' Get local setting for decimal point DP = Format$(0, ".") ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9" & DP & "]*" And _ Not Value Like "*" & DP & "*" & DP & "*" And _ Len(Value) 0 And Value < DP And _ Value < vbNullString End Function I'm not as concerned by the rejection of entries that include one or more thousand's separators, but we can handle this if we don't insist on the thousand's separator being located in the correct positions (in other words, we'll allow the user to include them for their own purposes... we'll just tolerate their presence). Function IsNumber(ByVal Value As String) As Boolean Dim DP As String Dim TS As String ' Get local setting for decimal point DP = Format$(0, ".") ' Get local setting for thousand's separator ' and eliminate them. Remove the next two lines ' if you don't want your users being able to ' type in the thousands separator at all. TS = Mid$(Format$(1000, "#,###"), 2, 1) Value = Replace$(Value, TS, "") ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9" & DP & "]*" And _ Not Value Like "*" & DP & "*" & DP & "*" And _ Len(Value) 0 And Value < DP And _ Value < vbNullString End Function -- Rick (MVP - Excel) "xp" wrote in message ... I need a function I can call in code that will return true if the current cell contents contains either a number or a formula that evaluates to a number. Can someone throw me a bone? Thanks in advance! |
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