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CIL 2026 | System | Question: 23

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In a circular queue using arrays, the rear is at index $4$, front is at index $2$, and capacity $=5$. Which expression checks if the queue is full?

  1. $($rear $==$ front $- 1)$
  2. $($rear $==$ front$)$
  3. $($rear $+ 1 ==$ front)$
  4. $(($ rear $+1) \%$ capacity $==$ front $)$

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