Ace Your C++ Skills 2025 – Rock the ‘Thinking in C++’ Challenge!

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Question: 1 / 565

What is true about the access speed of a register variable?

It is guaranteed to be faster.

It may increase depending on the system.

The correct answer is B. Register variables are stored in the CPU's register which are the fastest form of memory. However, the access speed of a register variable is not guaranteed to always be faster compared to other variables. It can also depend on the system's architecture and other factors such as the efficiency of the compiler. Therefore, while it is generally faster, it is not always guaranteed to be so. Options A, C, and D are incorrect for different reasons. Option A is incorrect because while register variables are generally faster, it is not always guaranteed to be the case. Option C is incorrect because register variables have a faster access speed compared to other variables. Option D is incorrect because register variables have a faster access speed due to their direct access to the CPU, not a slower one.

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It remains the same as other variables.

It is slower due to direct CPU access.

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