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

Question: 1 / 565

What guarantees does 'register' give about variable storage?

It will be stored in a register

It may be optimized by the compiler based on usage

It will have local scope

No guarantees; the compiler may ignore it

The 'register' keyword is a hint to the compiler that suggests that the variable should be stored in a register for faster access. However, the compiler ultimately has the discretion to decide whether or not to follow this suggestion. Therefore, there is no guarantee that the variable will actually be stored in a register, making option D the correct answer. Options A, B, and C may seem plausible but are not necessarily true. Option A is incorrect because the 'register' keyword is not a guarantee that the variable will be stored in a register. Option B is incorrect because the compiler may choose not to optimize the variable even if it is declared with the 'register' keyword. Option C is incorrect because the 'register' keyword does not affect the scope of the variable.

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