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volatile                 Volatile Data Type Modifier

    This keyword is used in declarations to ensure that the object it
    applies to is not subjected to certain optimizations by the compiler.
    Volatile identifies the object as being outside the control of this
    program, meaning that it may be set and tested asynchronously.  This
    is useful when writing device drivers and interrupt handlers or other
    tasks that map into shared memory. It is not yet implemented by MS-C.

      Notes:    The volatile keyword is a recent addition to the language
                and is not universally supported by compilers.

See Also: Types Type Modifiers

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