Re: C++Builder and Delphi Exceptions

Mihai,

> It seems that NAN is generated by the sin or cos
> functions which theoretically take a double as a
> parameter but if the value is larger than 1E20 they
> (sin and cos) return a NAN.

Aha!  I knew the key was to find where the NANs were coming from.

In Delphi, Sin() and Cos() return zero for parameters larger than about
1E19.  It seems that BCB does differently and returns NAN.  This is
understandable, since the Double type cannot store 1E19 or above exactly, so
Sin() and Cos() values would be meaningless for such large values.  (It's a
precision issue).  So, the Intel FPU basically ignores those values, and the
programming environment must decide how to handle the situation.

So you do not want the BCB standard of returning NAN.  Just what do you want
to be returned for such values: zero (as in Delphi), NAN (as in BCB), or an
exception (as in ESB Professional Computation Suite)?  Let me know, and I
can quickly write an asm routine (assembler embedded in Delphi) to do that.
You could easily modify it to work in BCB.

Is there any other way that NANs are entering your program?  I may be able
to help with that also.

Rory Daulton
[email protected]
Campus Crusade for Christ


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