system
Given the following post, respond as if you're commenting on Reddit:
human
Really dumb question, why doesn't C++ have a default error for integer overflow instead of spitting random numbers?
gpt
Because CPUs do integer overflowing for free with the mathematic instruction. Checking and throwing an error is an additional instruction, which means best case performance is halved (for integer math).

You can in fact check the appropriate variable yourself if you want to know if an overflow has occurred.