what is implementation-defined behavior? - EAS

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  1. Unspecified behavior

    Implementation-defined behavior is defined by the ISO C Standard in section 3.4.1 as: unspecified behavior where each implementation documents how the choice is made EXAMPLE An example of implementation-defined behavior is the propagation of the high-order bit when a signed integer is shifted right.
    clc-wiki.net/wiki/C_language:Terms:Implementation-defined_behaviour
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  2. People also ask
    What is the difference between implementation-defined behavior and undefined behavior?
    The only difference between Implementation-Defined Behavior and Undefined Behavior is that the former requires that implementations define and document a consistent behavior even in cases where nothing the implementation could possibly do would be useful.
    stackoverflow.com/questions/2397984/undefined-unspec…
    What is a subset of implementation-defined behavior?
    A subset of implementation-defined behavior is locale-specific behavior, which depends on the implementation-supplied locale . unspecified behavior - the behavior of the program varies between implementations, and the conforming implementation is not required to document the effects of each behavior.
    en.cppreference.com/w/cpp/language/ub
    What is an implementation definition?
    Behaviors designated as implementation-defined are generally those in which a user could make meaningful coding decisions based on the implementation definition. Implementors should bear in mind this criterion when deciding how extensive an implementation definition ought to be.
    stackoverflow.com/questions/2397984/undefined-unspec…
    What is the difference between implementation-defined and unspecified?
    The difference between implementation-defined and unspecified, is that the compiler is supposed to pick a behavior in the first case but it doesn't have to in the second case. For example, an implementation must have one and only one definition of sizeof (int).
    stackoverflow.com/questions/2397984/undefined-unspec…
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    stackoverflow.com
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    Nov 22, 2021
    What is undefined behavior (UB) in C and C++? What about unspecified behavior and implementation-defined behavior? What is the difference between them?
    ✓ Undefined behavior is one of those aspects of the C and C++ language that can be surprising to programmers coming from other languages (other languag…
    https://stackoverflow.com/questions/2397984

    Code sample

    int main() {
      char* p = "hello!\n";
      p[0] = 'y';
      p[5] = 'w';
      std::cout << p;...
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  4. https://learn.microsoft.com/en-us/cpp/c-language...

    Aug 3, 2021 · The ANSI section lists areas of the C language that ANSI leaves open to each particular implementation. This section describes how Microsoft C handles these …

  5. https://stackoverflow.com/questions/60973073

    Mar 31, 2020 · The definition of implementation-defined behavior in C is when something is left for the compiler to decide, and the compiler documents which choice it made. There are …

  6. C Language Tutorial => Implementation-defined behaviour

    https://riptutorial.com/c/topic/4832/implementation-defined-behaviour
    • General#
      1. The format of the messages emitted when assertions fail (7.2.1.1/2).
    • Floating-point environment functions#
      1. Any additional floating-point exceptions beyond those defined by the standard (7.6/6). 2. Any additional floating-point rounding modes beyond those defined by the standard (7.6/8). 3. Any additional floating-point environments beyond those defined by the standard (7.6/10). 4. The def…
    See more on riptutorial.com
    • Last updated: Jul 12, 2010
    • Undefined behavior - cppreference.com

      https://en.cppreference.com/w/cpp/language/ub

      2 days ago · implementation-defined behavior - the behavior of the program varies between implementations, and the conforming implementation must document the effects of each …

    • https://stackoverflow.com/questions/22180312

      Mar 4, 2014 · Implementation-defined differs from unspecified behavior in that the implementation in the former case must clearly document what it's doing (in the latter case, it …

    • https://stackoverflow.com/questions/69013859

      Sep 1, 2021 · Implementation defined behaviour is really different from Undefined Behaviour. implementation defined behaviour means that an implementation must choose one of the …

    • https://stackoverflow.com/questions/19912235

      Nov 19, 2013 · Implementation defined means that the compiler writer chooses what happens, and that is just it. There's nothing stopping you from changing your mind and do it another way …

    • Implementation-defined behavior (The C Preprocessor)

      https://gcc.gnu.org/onlinedocs/cpp/Implementation-defined-behavior.html

      11.1 Implementation-defined behavior. This is how CPP behaves in all the cases which the C standard describes as implementation-defined. This term means that the implementation is …

    • Implementation defined behavior control - cppreference.com

      https://en.cppreference.com/w/cpp/preprocessor/impl

      2 days ago · 1) Behaves in implementation-defined manner 2) Removes the L prefix (if any), the outer quotes, and leading/trailing whitespace from string-literal, replaces each \" with " and …

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