I lost my post so I am trying again.

I have a basic calculator program that has a few minor bugs or 'System.OverflowException' exceptions.

Here is the code I have so far:

'Declare FirstNum and SecondNum variables
    Dim FirstNum, SecondNum As Short

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        End
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        'Assign text box values to variables
        FirstNum = TextBox1.Text
        SecondNum = TextBox2.Text

        'Determine checked button and calculate
        If RadioButton1.Checked = True Then
            TextBox3.Text = FirstNum + SecondNum
        End If
        If RadioButton2.Checked = True Then
            TextBox3.Text = FirstNum - SecondNum
        End If
        If RadioButton3.Checked = True Then
            TextBox3.Text = FirstNum * SecondNum
        End If
        If RadioButton4.Checked = True Then
            TextBox3.Text = FirstNum / SecondNum
        End If
    End Sub

End Class

Here are my exceptions:

   1. When I test to add (+) the following equation, 99999 + 99999 I get a 'System.OverflowException' I need to modify the code to catch and handle this exception so the user can continue.

   2. Under the divide (/) function, division by 0 of course will produce an infinite number. Here I want to modify the program so that the user input is validated before the divide operation is performed, and modify the program to raise an exception, then add the code to handle this exception.

   3.  Under the multiply (*) function, for some reason my program will not take (99 * 999) I need to fix this exception as well.

   4. Finally, the subtract (-) wow now here is a good one. If I subtract 32000 - (-767) the answer is 32767, however add one more to the negative (-768) and Bam! another exception.

I want to use Try Catch in all the areas. Can someone help me please.

12String

       

Hi,
basic usage of try..catch

try     ' my code goes here catch (e as Exception)     ' do something with the error end try

Example:

'Determine checked button and calculate         If RadioButton1.Checked = True Then             try                 TextBox3.Text = FirstNum + SecondNum             catch (e as Exception)                  textbox3.text = e.Message              end try         End If

Hope this helps,
Kieron


____________________________
Build it better, faster, quicker, easier.. then fix it (non-offical MS mission statement)

Kieron,

I tried inserting the code sample you gave, I am still getting an error message right at the beginning on the line:

FirstNum = TextBox1.Text

What I need to know is how do I overcome this Exception error and force the program to calculate more than 4 character numbers. Once I enter the values 99999 + 99999
Calculate that is when the Exception error appears on the above mentioned line.

Help!    

Hi,
Can you post up your code pls?
K

____________________________
Build it better, faster, quicker, easier.. then fix it (non-offical MS mission statement)

Looks to me like you're overflowing your variables. You have declared them as "Short" which is a 2byte number from -32767 to + 32767. Try declaring it as a long.

Steve  

Had to keep variables for FirstNum and SecondNum As Short.

Used Try Catch to handle SystemOverflows followed by appropriate messages. Program works like a charm and I received an A thank you to all who gave me suggestions. I used them with the MSDN library and Wa la finished product.

Thanks again,
12String