[tialaramex]

Rust provides a default integer of each common size and signedness, for which overflow is prohibited [but this prohibition may not be enforced in release compiled binaries depending on your chosen settings for the compiler, in this case what happens is not promised but today it will wrap - it's wrong to write code which does this on purpose - see the wrapping types below if you want that - but it won't cause UB if you do it anyway]

Rust also provides Wrapping and Saturating wrapper types for these integers, which wrap (255 + 1 == 0) or saturate (255 + 1 == 255). Depending on your CPU either or both of these might just be "how the computer works anyway" and will accordingly be very fast. Neither of them is how humans normally think about arithmetic.

Furthermore, Rust also provides operations which do all of the above, as well as the more fundamental "with carry" type operations where you get two results from the operation and must write your algorithms accordingly, and explicitly fallible operations where if you would overflow your operation reports that it did not succeed.