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Asked: 2026-06-15T07:46:02+00:00

As an example of implementation defined behavior in C. The C Standard says that

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As an example of implementation defined behavior in C. The C Standard says that the size of data types are implementation defined. So, say sizeof(int) is implementation defined.

  1. Does this implementation defined behavior mean that the size(int) is platform dependent or defined by compiler vendor or both?

  2. Once I compile my code, does implementation dependencies would still apply when I run it on different versions of platforms? Would I get performance loss for compiling implementation defined code on one platform and running it on other?

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1 Answer

  1. Editorial Team

    Yes, implementation defined means that it depends on the platform (Architecture + OS ABI + compiler).

    And yes, implementation defined features can differ across different versions of the platform.

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