![]() value is outside of the domain of a function), an unavailable resource (like a missing file, a hard disk error, or out-of-memory errors), or that the routine has detected a normal condition that requires special handling, e.g., attention, end of file.Įxception handling solves the semipredicate problem, in that the mechanism distinguishes normal return values from erroneous ones. Common exceptions include an invalid argument (e.g. the programmer may deem division by zero to be undefined, hence an exception, or devise some behavior such as returning zero or a special "ZERO DIVIDE" value (circumventing the need for exceptions). The set of "normal" circumstances is defined entirely by the programmer, e.g. The precondition, and the definition of exception, is subjective. The exception handling mechanism then handles the exception. An exception handling mechanism allows the procedure to raise an exception if this precondition is violated, for example if the procedure has been called on an abnormal set of arguments. The definition of an exception is based on the observation that each procedure has a precondition, a set of circumstances for which it will terminate "normally". Some exceptions, especially hardware ones, may be handled so gracefully that execution can resume where it was interrupted. ![]() Exception handling, if provided, is facilitated by specialized programming language constructs, hardware mechanisms like interrupts, or operating system (OS) inter-process communication (IPC) facilities like signals. 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. 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. ![]() For knowledge, see fact checking and problem solving. ![]()
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