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- Undefined_behavior abstract "In computer programming, undefined behavior refers to computer code whose behavior is specified to be arbitrary. It is a feature of some programming languages—most famously C. In these languages the semantics of certain operations are undefined, so an implementation can assume that such operations never occur in program code, since the implementation will be correct whatever it does in such cases analogously to don't-care terms in digital logic. This assumption can make various program transformations valid or simplify their proof of correctness giving flexibility to the implementation. It is the responsibility of the programmer to write code that never invokes undefined behaviour, but an implementation is allowed to print diagnostics when it happens.For example, in C the use of any automatic variable before it has been initialized yields undefined behavior, as does division by zero or indexing an array outside of its defined bounds (see buffer overflow). In general, any behavior afterwards is also undefined. In particular, it is never required that the compiler diagnose undefined behavior — therefore, programs invoking undefined behavior may compile and run without apparent failures or fail in seemingly unrelated ways, or behave seemingly inconsistently with the source code.Under some circumstances there can be specific restrictions on undefined behavior. For example, the instruction set specifications of a CPU might leave the behavior of some forms of an instruction undefined, but if the CPU supports memory protection then the specification will probably include a blanket rule stating that no user-accessible instruction may cause a hole in the operating system's security; so an actual CPU would be permitted to corrupt any or all user registers in response to such an instruction but would not be allowed to, for example, switch into supervisor mode.In C and C++, implementation-defined behavior is also used, where the language standard does not specify the behavior, but the implementation must choose a behavior and needs to document and observe the rules it chose. These standards also use unspecified behavior to mean that from a given set of possibilities it is not specified which behaviour an implementation must choose, it need not document the choice or even be consistent, but it must choose one possibility.".
- Undefined_behavior wikiPageExternalLink nasal-demons.html.
- Undefined_behavior wikiPageExternalLink n1256.pdf.
- Undefined_behavior wikiPageID "515992".
- Undefined_behavior wikiPageRevisionID "605612492".
- Undefined_behavior hasPhotoCollection Undefined_behavior.
- Undefined_behavior subject Category:Articles_with_example_C++_code.
- Undefined_behavior subject Category:C++.
- Undefined_behavior subject Category:C_programming_language.
- Undefined_behavior subject Category:Programming_language_implementation.
- Undefined_behavior comment "In computer programming, undefined behavior refers to computer code whose behavior is specified to be arbitrary. It is a feature of some programming languages—most famously C. In these languages the semantics of certain operations are undefined, so an implementation can assume that such operations never occur in program code, since the implementation will be correct whatever it does in such cases analogously to don't-care terms in digital logic.".
- Undefined_behavior label "Comportamento indefinido".
- Undefined_behavior label "Undefined behavior".
- Undefined_behavior label "Неопределённое поведение".
- Undefined_behavior label "未定义行为".
- Undefined_behavior sameAs Comportamiento_indefinido.
- Undefined_behavior sameAs Comportamento_indefinido.
- Undefined_behavior sameAs m.02kjpr.
- Undefined_behavior sameAs Q1964707.
- Undefined_behavior sameAs Q1964707.
- Undefined_behavior wasDerivedFrom Undefined_behavior?oldid=605612492.
- Undefined_behavior isPrimaryTopicOf Undefined_behavior.