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# Arithmetic operation resulted in an overflow.

Posted on 2014-02-28
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I am getting the error Arithmetic operation resulted in an overflow.

``````Function setthepercentage(ByVal thegoals As List(Of Integer), ByVal thename As String) As String

Dim over05 As Integer = 0
Dim over15 As Integer = 0
Dim over25 As Integer = 0
Dim countelements As Integer = 0
'work out if it is 0.5 - 1,3,4,5,3,2,4,5,

For Each element As String In thegoals
'chekc if over 0.5
countelements = countelements + 1
If element > 0 Then
over05 = over05 + 1
'check if over 1.5
ElseIf element > 1 Then
over15 = over05 + 1
'check if over 2.5
ElseIf element > 2 Then
over25 = over05 + 1
End If

Next

over05 = (over05 / countelements) * 100
If over05 <> "NaN" Then
Session(thename & "over05") = over05
End If
over15 = (over15 / countelements) * 100

If over15 <> "NaN" Then
Session(thename & "over15") = over15
End If

over25 = (over25 / countelements) * 100

If over25 <> "NaN" Then
Session(thename & "over25") = over25
End If
End Function
``````

What its supposed to do is set the percentage...

so if elements number if greater then 0 i added 1 to the tally

`````` If element > 0 Then
over05 = over05 + 1
end if
``````
I also count how many times it goes through a loop so

``````        countelements = countelements + 1
``````
this give me the numbers to work with so:

``````over05 = (over05 / countelements) * 100
``````

but this gives me the error Arithmetic operation resulted in an overflow.
0
Question by:runnerjp2005
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LVL 44

Expert Comment

ID: 39894375
Use Long instead of Integer as the data type
0

Author Comment

ID: 39894391
I seem to get the same error
0

LVL 44

Accepted Solution

AndyAinscow earned 2000 total points
ID: 39894396
I'd single step through your code (or use a pencil and paper and work through it).  There might be something wrong in the logic.
If it overruns a Long we are talking pretty BIG numbers.
0

LVL 52

Expert Comment

ID: 39894400
Can you post samples of some input values that cause the overflow?
0

LVL 83

Expert Comment

ID: 39894477
Could the problem be with following conditions?

If over05 <> "NaN" Then

Comment these out and see what happens.

If you still get an error, tell us on which line.
0

Author Closing Comment

ID: 39894596
Walked through it and found i had 0 0/0*0 cant be done :) thanks
0

LVL 40

Expert Comment

ID: 39895731
It can be done, but by putting the result in a Double, which is able to record an infinite.
0

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