Undefined behaviours in C

In C programming, undefined behaviours (UB) present perhaps one of the biggest challenges to beginners. As an occasional practitioner, I am still baffled by them–which happened recently with the code that I wrote in an Arduino sketch. [crayon-5ba3ed00afd61410526415/] The function get_input() is generic. Besides parameter String prompt, it takes two generic function pointer parameters (*parse_func)(void*…

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