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Can a variable be both const and volatile?

Yes. The const modifier means that this code cannot change the value
 of the variable, but that does not mean that the value cannot be
 changed by means outside this code. For instance, in the example in
 FAQ 8, the timer structure was accessed through a volatile const
 pointer. The function itself did not change the value of the timer, so it
 was declared const. However, the value was changed by hardware on
 the computer, so it was declared volatile. If a variable is both const and
 volatile, the two modifiers can appear in either order.

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