Exception

The representation of an unexpected situation that affects control flow.

Related concepts:  ObjectControl FlowReturn

Closest Wikipedia entry:  Exception handling — In computing and computer programming, exception handling is the process of responding to the occurrence of exceptions – anomalous or exceptional conditions requiring special processing – during the execution of a program. In general, an exception breaks the normal flow of execution and executes a pre-registered exception handler; the details of how this is done depend on whether it is a hardware or software exception and how the software exception is implemented. Exceptions are defined by different layers of a computer system, and the typical layers are CPU-defined interrupts, operating system (OS)-defined signals, programming language-defined exceptions.

Authoritative Definition

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Misconceptions about Exception
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