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OverFlow Error

Posted on 2006-06-15
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Last Modified: 2010-04-30
I need to store decimal point values in a variable, the range of values is 19.999999 to 0.999999...

The problem is what type do I declare my variable as because....

Integer and Long no good as it rounds decimal places...

Decimal has a range of "For numbers with 28 decimal places, the range is
+/-7.9228162514264337593543950335. The smallest possible non-zero number is 0.0000000000000000000000000001."

Single has a range of "-3.402823E38 to -1.401298E-45 for negative values; 1.401298E-45 to 3.402823E38 for positive values."
 
Variant is the same as "Same range as Double for numerics."  

Thanks Ian

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Question by:ISC
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10 Comments
 
LVL 76

Expert Comment

by:GrahamSkan
ID: 16909757
You can store the numbers 19.999999 to 0.999999... in doubles. How many significant digits (how accurate) do you need?
0
 
LVL 1

Author Comment

by:ISC
ID: 16909771
At least 2 significant digits and 6 decimal places...

I tried this but I get an overflow error...


Ian
0
 
LVL 1

Author Comment

by:ISC
ID: 16909817
The calculation causing the problem ss...

   Dim k As Double
       
    k = m_objAccrualRecord.m_intNumberOfDays * 100 * l_dblDailyAccrualTotal

This caused an overflow, however if I change the code to...

  Dim k As Double
       
        k = CDbl(m_objAccrualRecord.m_intNumberOfDays) * CDbl(100) * l_dblDailyAccrualTotal

It works....!
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LVL 76

Expert Comment

by:GrahamSkan
ID: 16909872
There is a buglet in VB. The calculation can start off assuming (for speed) that it is using integers, only to be confounded later on by a number too big to fit into its temporary location.
0
 
LVL 1

Author Comment

by:ISC
ID: 16909879
Thanks I did not know that...!
0
 
LVL 26

Expert Comment

by:EDDYKT
ID: 16910426
how about


k = l_dblDailyAccrualTotal * 100.0 * m_objAccrualRecord.m_intNumberOfDays
0
 
LVL 26

Expert Comment

by:EDDYKT
ID: 16910501
or


k = m_objAccrualRecord.m_intNumberOfDays * 100.0 * l_dblDailyAccrualTotal
0
 
LVL 1

Author Comment

by:ISC
ID: 16918579
My solution was to use CDbl( ) in the formula this worked and stopped the overflow error...!

 Dim k As Double
       
        k = CDbl(m_objAccrualRecord.m_intNumberOfDays) * CDbl(100) * l_dblDailyAccrualTotal
0
 

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