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  • I think the standard is that it is undefined for integer math. The floating point is according to the IEEE standard and returns a nan, but no exception. Catching an exeption in the Arduino is not possible (I think) : stackoverflow.com/questions/10095591/… When you find strange things with a byte, please give a full sketch that we can try and tell us which arduino board you use. Commented Nov 28, 2018 at 19:48
  • @Jot This is an interesting point but why would a nan be replaced with 4294967295. Apparently they don't have the same binary value. Why did Atmel not include a nan value (that maybe could be disabled through fuses) in their processor architecture. This is a useful troubleshooting feature that is heavily used in all major programming languages. Commented Nov 28, 2018 at 19:53
  • @Jot I used an Arduino nano with an Atmega 328p on board. Commented Nov 28, 2018 at 19:54
  • An integer can not be a 'nan', that is specified for floating point. Please update your question with board and microcontroller, and perhaps a full sketch. Commented Nov 28, 2018 at 19:57
  • I tried to make a sketch myself, and I have different results. Please show your sketch and tell us the results of the sketch that you show. Are you running this in a simulator? Commented Nov 28, 2018 at 20:04