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

The register keyword suggests to the compiler that the variable should be kept in a CPU register for quick access. This is a type of temporary storage that is typically faster than other storage options, such as memory. This allows for faster retrieval and manipulation of the variable's value.

Option A, to store the variable in the fastest available storage, is not entirely accurate. While registers are generally faster than other storage options, there may be optimizations or other factors that could make a different storage option faster in certain scenarios.

Option C, to make the variable local to a block of code, is incorrect. The register keyword does not have anything to do with the scope of the variable - it simply suggests a specific type of storage to the compiler.

Option D, to optimize the variable for mathematical operations, is also incorrect. While using registers can potentially speed up mathematical operations on variables, the register keyword itself does not