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Re: Capture division by zero [message #55278 is a reply to message #55273]

Tue, 27 October 2020 11:09

mirek is currently offline

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

koldo wrote on Tue, 27 October 2020 10:58

CrashHandler works only in DEBUG and is connected to TheIDE so when debugging you can capture floating point (FP) and other problems. Production code could not use CrashHandler.

Which is another stupid mistake. You expect to catch all those FP bugs during debugging? I can tell with 100% probability that you are going to miss something, because it all depends on input data. So the end result of your effort will be that in release you will be getting unexpected NaNs and the whole thing will collapse.

Quote:

Division by zero and other FP errors, are errors and have to be debugged. Just imagine two situations:
- The calculation of your bank account balance is infinite

No. If the end result of complex operation is infinite, the whole operation has to be rejected. In your application, it will be infinite, because you thought that you have fixed all FP bugs and you do not have any safeguards for unexpected inputs

Quote:

- The controller that determines the direction of your car with automatic driving sets an infinite angle

Which is exactly what can happen with your approach. Correctly written code will reject invalid angle.

Quote:

I do not want my code to fall in these situations.

But you are going exactly into that trap. As I said, been there....

Mirek

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[Message index]

		FP exception vs NaN By: koldo on Mon, 26 October 2020 21:08
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 09:23
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 11:09
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 11:16
		Re: Capture division by zero By: koldo on Tue, 27 October 2020 11:38
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 11:40
		Re: Capture division by zero By: koldo on Tue, 27 October 2020 11:36
		Re: Capture division by zero By: koldo on Tue, 27 October 2020 17:18
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 18:52
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 19:19
		Re: Capture division by zero By: koldo on Tue, 27 October 2020 19:25
		Re: Capture division by zero By: Klugier on Tue, 27 October 2020 20:35
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 20:47
		Re: Capture division by zero By: koldo on Wed, 28 October 2020 09:29
		Re: Capture division by zero By: mirek on Tue, 27 October 2020 20:50
		Re: Capture division by zero By: koldo on Wed, 28 October 2020 09:24
		Re: Capture division by zero By: mirek on Wed, 28 October 2020 13:51
		Re: Capture division by zero By: mirek on Wed, 28 October 2020 14:04
		Re: Capture division by zero By: koldo on Thu, 29 October 2020 14:19
		Re: Capture division by zero By: mirek on Mon, 02 November 2020 10:31
		Re: Capture division by zero By: koldo on Mon, 02 November 2020 18:07

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