Ace Your C++ Skills 2026 – Rock the ‘Thinking in C++’ Challenge!

Question: 1 / 565

What does the volatile keyword suggest about a variable's value?

It should be optimized for speed.

It may change unexpectedly.

The volatile keyword indicates that a variable's value may change unexpectedly. This means that the value can be modified by multiple threads without a predictable pattern, making it more difficult to ensure data consistency. The other options are incorrect because A) optimization for speed has no correlation to the usage of the volatile keyword, and B) the variable's value can still be changed even in the absence of the volatile keyword, so it is not considered immutable. Additionally, D) local variables are not affected by the use of the volatile keyword, which is typically used for global variables.

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It is immutable.

It is local to the function.

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