Question

EInvalidOp with message 'Invalid floating point operation' -- cannot determine cause of exception

Asked by: prufrock17


Hi,

All right, I'm stumped on this one.  I am using C++ Builder 6, and I keep getting the 'Invalid floating point operation' exception when I execute a certain line of code.

I am calling the following member function:

        AmpHoursRemainingSet(0.0);

which looks like

void MyClass::AmpHoursRemainingSet(float value)
{

  if (0.0 > 3.3)
    {
        value = AD_NEW_BATTERY_MAXIMUM_AMP_HOUR_CAPACITY;
    }
 
  if (value > 3.3)
    {
        value = AD_NEW_BATTERY_MAXIMUM_AMP_HOUR_CAPACITY;
    }

}

Whenever the second if statement is executed, the exception occurs.  (I put the first if statement in to verify the values are  not causing the problem).

I have absolutely no idea why this may be occurring -- or how I can go about debugging this.  I have not had any problems with floating point types in Borland before, so I do not know why it is occurring with this application.

Also, this happens in a number of spots -- sometimes with comparisons, sometimes with assignments.  If I hard-code numbers in, the problem disappears.

Any thoughts/comments would be great.

Thanks,
Jeff

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Asked On
2006-01-04 at 08:31:10ID21683663
Tags

point

,

floating

,

invalid

,

operation

,

einvalidop

Topic

C++ Builder

Participating Experts
1
Points
125
Comments
2

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Answers

 

by: cwwkiePosted on 2006-01-04 at 10:24:28ID: 15610171

Probably the last floating point operation before the function call to AmpHoursRemainingSet is invalid. For example because NaN is used in a operation. When you use hard-coded numbers, the compiler will evaluate the expression, and no floating point operation is generated.

You can avoid it by remasking the fpu exceptions (http://homepages.borland.com/ccalvert/TechPapers/FloatingPoint.html):
#include float.h

__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
  _control87(MCW_EM, MCW_EM);
}

Here is a related story: http://www.virtualdub.org/blog/pivot/entry.php?id=53

 

by: prufrock17Posted on 2006-01-04 at 11:22:53ID: 15610769


>  Probably the last floating point operation before the function call to AmpHoursRemainingSet is invalid

This is exactly what happened.  I did not think about evaluating previous operations.  Thanks!

20120131-EE-VQP-002

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