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Some programming languages support dedicating a block of code to run regardless of whether an exception occurs before the code is reached; this is called finalization.{{sfn|Sebesta|2012|p=635}}
There is a tradeoff between increased ability to handle exceptions and reduced performance.{{sfn|Sebesta|2012|p=631}} For example, even though array index errors are common{{sfn|Sebesta|2012|p=261}} C does not check them for performance reasons.{{sfn|Sebesta|2012|p=631}} Although programmers can write code to catch user-defined exceptions, this can clutter a program. Standard libraries in some languages, such as C, use their return values to indicate an exception.{{sfn|Sebesta|2012|p=632}} Some languages and their compilers have the option of turning on and off error handling capability, either temporarily or permanently.{{sfn|Sebesta|2012|pp=631, 635–636}}
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