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04.24.2003 at 02:22PM PDT, ID: 20595580
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7.2

Erroneous math calculations in MS Visual Basic 6.0 (and .NET)

Asked by c0dejunkie in Visual Basic Programming, Microsoft Programming

Tags: ,

In the past few days, my coworkers and I have discovered that we are getting some very disturbing results doing simple floating point math in Visual Basic 6.0 (SP5) running on Windows 2000 (SP2). Using just the VB "Immediate" window, the following statements were executed with the indicated results.

? 45.21 - 45
 0.210000000000001

? 4521 - 4500
 21

? (4521 - 4500)/100
 0.21

? ((45.21*100)-(45*100))/100
 0.210000000000001

? 123.0567 - 123
 5.67000000000064E-02

Writing a simple application to do essentially the same thing, the application was compiled and executed on a Windows 98 machine also in our office with the same results. Additionally, we opened our .NET environment and performed similar tests in C# with the same floating point errors.

Frankly, I'm just blown away by this. I don't understand how it could possibly be occuring in all our machines with a product used world-wide.

My question is merely this; Is anyone else experiencing this issue, and is there a solution?
I will award the points (meager as they are) to the first person that can provide me a definative answer, preferably with a solution. However, I am very curious to hear if anyone else is experiencing this issue, too.

Thanks for your assistance.
-Ross
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[+][-]04.24.2003 at 02:34PM PDT, ID: 8391417

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[+][-]04.24.2003 at 04:46PM PDT, ID: 8391939

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About this solution

Zones: Visual Basic Programming, Microsoft Programming
Tags: basic, visual
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Solution Provided By: PhiliP
Participating Experts: 4
Solution Grade: A
 
 
[+][-]04.24.2003 at 05:19PM PDT, ID: 8392023

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[+][-]04.25.2003 at 01:51AM PDT, ID: 8393722

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[+][-]04.25.2003 at 02:34AM PDT, ID: 8393899

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[+][-]04.25.2003 at 04:02AM PDT, ID: 8394276

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[+][-]04.25.2003 at 08:27AM PDT, ID: 8395989

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[+][-]04.25.2003 at 09:26AM PDT, ID: 8396462

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