Interview Questions

Can a variable be both const and volatile?

C Interview Questions and Answers


(Continued from previous question...)

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 , the timer structure was accessed through a volatile const pointer. The function itself did not change the value of the timer, 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.

(Continued on next question...)

Other Interview Questions