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Exception handling and EInvalidOp:

What is the correct syntax for exception handling of EInValidOp?  The catch formulation I am using below does not work.

//////////////////////////////
try
{
     offending statement that potentially throws a floating point error
}
catch (EInvalidOp &exception)
{
     OffendingVar = 0;      // and not the -1.#QNAN I was getting.
     Memo1->Lines->Add("An Exception Occured and variable was fixed:");
}