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Run-time checking
Runtime checking is a mechanism of a programming language to check for errors at runtime, e.g. arithmetic overflows or invalid type casts. Most times an exception is thrown and/or the program is terminated, instead of ignoring this failure as it is done in C, C++ etc.
Runtime checking is often criticized for slowing down the resulting program. However this ignores the fact that most compilers for languages with runtime checking allow one to switch the checks off when performance is more important.
While on the other hand, adding runtime checking to a language that does not support it normally is close to impossible, since those languages don't have the needed language constructs.
Runtime checks can be very beneficial. In the case of Ariane 5 Flight 501, the lack of runtime checks caused a critical computer error, costing the ESA €885,000,000.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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