>behavior, upon use of a non portable or erroneous program construct or of erroneous data, for which this International Standard imposes no requirements
>2 NOTE Possible undefined behavior ranges from ignoring the situation completely with unpredictable results, to behaving during translation or program execution in a documented manner characteristic of the environment (with or without the issuance of a diagnostic message), to terminating a translation or execution (with the issuance of a diagnostic message).
>3 EXAMPLE An example of undefined behavior is the behavior on integer overflow.
