Discussion
For which of the following situation should the register storage class be used?
Answer: B
Correct answer: For loop counter
register is worth asking for where a variable is accessed very often, and a loop counter is the classic case - it is read and written on every iteration. It cannot be used where the variable’s address is needed, since a register has no address. In practice modern compilers allocate registers better than the hint does, so the keyword is now of historical interest.
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