is there any is integer function ?

[Tee]

Hi,

how do we detect if a value is a positive integer ?

thanks,
Tee

 

[TJS]

if myValue > 0 then ...

 

[Scott Mitchell [MVP]]

how do we detect if a value is a positive integer ?

Are you using VB.NET or C#? In C# I'd do:

if (x is int)
{
if ((int) x) > 0)
// x is a positive integer
else
// x is a negative integer
}
else
// x is NOT an integer at all!


In VB.NET you can use IsNumeric().

--

Scott Mitchell
(e-mail address removed)
http://www.4GuysFromRolla.com
http://www.ASPFAQs.com
http://www.ASPMessageboard.com

* When you think ASP, think 4GuysFromRolla.com!

 

[Scott M.]

And how would this know the difference between 1 and 1.1?

if x > 0 AND x = CTYPE(x, Integer) then

 

[Tee]

Hi,

Thanks for your reply,
I know about the isnumeric, but ... whatever number value will return true
with isnumeric, so I hope to get something like isInteger() ...

thanks.
Tee

 

[Tee]

Great idea,

Thanks.

And how would this know the difference between 1 and 1.1?

if x > 0 AND x = CTYPE(x, Integer) then

 

[Harsh Thakur]

Hi,

As noted before, for a positive integer, you can just say:
if(x > 0)
To test whether x is in integer, you can say:
x = int.Parse(value.ToString())
where value is the number you want to check.

If value represents an integer, x will contain it after
the step given above. Else an FormatException will be
thrown.

For more details you can check out int.Parse in MSDN.

HTH
Regards
Harsh Thakur

 

[Kevin Spencer]

with isnumeric, so I hope to get something like isInteger() ...

You need to re-read Scott's reply. That was the first thing he tested for.

--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
Big things are made up
of lots of little things.

 

[JesseChallis]

A different Approach

public bool IsNumber(string text)
{
bool result = true;
foreach (var c in text)
{
if (!Char.IsDigit(c))
{
result = false;
break;
}
}

return result;
}

Cheers

 

[rutgers]

Try this:


If IsNumeric(UserInputTextBox.Text) And (System.Math.Abs(val(UserInputTextBox.Text) Mod 1) <> 0) Then
'______Do something
End if

************************
OR Atfer checking IsNumeric(UserInputTextBox.Text)
Do this following:

if (System.Math.Abs(val(UserInputTextBox.Text) Mod 1) <> 0)

 

[kmoloney]

Positive Integer Function in vb.net

In vb.net you get a cast error if you pass a string in some functions. This should take care of it:


Private Function IsPositiveInteger(ByVal objValue AsObject) As Boolean
Dim intX AsInteger
If Not (IsNumeric(objValue)) Then
Return False
Else
intX = CInt(objValue)
If objValue > 0 Then
Return True
Else
Return False
End If
End If

 

[AJBiagioli]

' inputString is the string we want to test.
Dim number As Integer
If TryParse(inputString, number) AndAlso number > 0
'''' Continue here ....
End If