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Arithmetic operation resulted in an overflow.

Posted on 2014-02-28
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Last Modified: 2014-02-28
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

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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

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I also count how many times it goes through a loop so

        countelements = countelements + 1

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this give me the numbers to work with so:

over05 = (over05 / countelements) * 100

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

Expert Comment

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

Author Comment

by:runnerjp2005
ID: 39894391
I seem to get the same error
0
 
LVL 44

Accepted Solution

by:
AndyAinscow earned 500 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.
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LVL 52

Expert Comment

by:Carl Tawn
ID: 39894400
Can you post samples of some input values that cause the overflow?
0
 
LVL 83

Expert Comment

by:CodeCruiser
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

by:runnerjp2005
ID: 39894596
Walked through it and found i had 0 0/0*0 cant be done :) thanks
0
 
LVL 40
ID: 39895731
It can be done, but by putting the result in a Double, which is able to record an infinite.
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