Discussion
A ring buffer of \( n \) slots is often used with one slot left empty in order to
Answer: A
Correct answer: distinguish the full condition from the empty one
With the indices equal in both cases, full and empty are indistinguishable. Leaving one slot unused means the buffer is full when advancing the write index would reach the read index, and empty when the two are equal - two conditions now told apart, at the cost of one slot. The alternative is to keep a separate count.
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