parse string into decimal variable

[mavy-online]

Howdy,

dim a as decimal
dim b as string = "169.65"

How do i get b into a, without removing the dot ?

Thanks.

[dglienna]

That would be the INTEGER portion.

[mavy-online]

That would be the INTEGER portion.

Thanks for your reply, however i do not understand it.

A code sample would help me alot.

[dglienna]

That's the kind of question that you can search the web for.

vb.net string to integer site:microsoft.com

Module StringParsing
   Public Sub Main()
      TryToParse(Nothing)
      TryToParse("160519")
      TryToParse("9432.0")
      TryToParse("16,667")
      TryToParse("   -322   ")
      TryToParse("+4302")
      TryToParse("(100)")
      TryToParse("01FA")
   End Sub

   Private Sub TryToParse(value As String)
      Dim number As Integer
      Dim result As Boolean = Int32.TryParse(value, number)
      If result Then
         Console.WriteLine("Converted '{0}' to {1}.", value, number)
      Else
         If value Is Nothing Then value = "" 
         Console.WriteLine("Attempted conversion of '{0}' failed.", value)
      End If     
   End Sub
End Module
' The example displays the following output to the console:
'       Attempted conversion of '' failed.
'       Converted '160519' to 160519.
'       Attempted conversion of '9432.0' failed.
'       Attempted conversion of '16,667' failed.
'       Converted '   -322   ' to -322.
'       Converted '+4302' to 4302.
'       Attempted conversion of '(100)' failed.
'       Attempted conversion of '01FA' failed.

http://msdn.microsoft.com/en-us/library/f02979c7.aspx

[David Anton]

a = CDec(b)

or

a = System.Convert.ToDecimal(b)

if you don't like the VB-ish casting

[dglienna]

Sure about that?

a = CDec("Foo")

[David Anton]

You're right - it's not idiot-proof.
It will only work when you can reasonably assume that the argument is the string version of a decimal number.

If the argument is likely to be any junk then you'll have to use your approach or Decimal.TryParse.
However, in that case I think the flaw is how you allowed "Foo" as an input in the first place - if you're reading the input from a textbox, for instance, you would never allow "Foo" as an input - you would filter the input to prevent "Foo" or use a masked textbox.

[rsutton84]

You can...
Dim firststr As String = "hello"
Dim firstdec As Decimal = 1.5
Dim result As String = Decimal.Parse(firstdec)
Dim Themain As New String(result + firststr)
Console.WriteLine(Themain)
Console.ReadLine()

Converting dec to string example
If joining the two lines.,... im new so I may be wrong

[mavy-online]

I thank all of you for your responses, however all solutions mentioned, are incorrect.

dim a as string = "169.65"
dim b as decimal = System.Convert.ToDecimal(a)
' Now b = 16965

dim a as string = "169.65"
dim b as decimal = CDec(a)
' Now b = 16965 (no dot)

dim a as string = "169.65"
dim b as decimal = Decimal.Parse(a)
' Now b = 16965 (no dot)

dim a as decimal = 169.65
' Now a = 169.65 (there is a dot) This is what i want.
I am parsing a TEXT file, into decimal variables.

There is no way you can distinguish between 5.85 and 585, if that dot gets removed every
time. There has got to be a simple way of getting a decimal value parsed into a decimal
variable without it removing the dot, especially when "dim a as decimal = 169.65 " leaves the
dot in place.


Every method, removes the dot.

[dglienna]

What's 169.95 - 169?

Isn't the Integer part 169?

Isn't that SUBTRACTION?

[David Anton]

The dot is being remove some other way in your code.
CDec and System.Convert.ToDecimal certainly do not remove the dot.
If the string contains a valid decimal, then that decimal value is extracted via CDec or System.Convert.ToDecimal.

[Erik Wiggins]

dim a as Single
dim b as string = "169.65"

Convert.ToSingle(b)

The single point data type and conversion will maintian your decimal place. At least it does on my computer.

[mavy-online]

The dot is being remove some other way in your code.
CDec and System.Convert.ToDecimal certainly do not remove the dot.
If the string contains a valid decimal, then that decimal value is extracted via CDec or System.Convert.ToDecimal.

what other code? Its only 4 lines:

Dim a As Single
Dim b As String = "169.65"

a = Convert.ToSingle(b)
Button1.Text = a

Uploaded with ImageShack.us

Same with every other method mentioned, The dot gets removed or at least moved to some other spot, with every other method mentioned.

[David Anton]

You've got something weird happening on your system or some bad locale setting.
When I try the same code I get 169.65 assigned to 'a'.

[mavy-online]

You've got something weird happening on your system or some bad locale setting.
When I try the same code I get 169.65 assigned to 'a'.

Just my luck.

This is a default visual basic installation. Any tips on how to fix this ?