Question
A banking application uses a Queue to process customer service requests. The following operations are performed: ENQUEUE(Request_
- A → ENQUEUE(Request_
- B → ENQUEUE(Request_
- C → DEQUEUE() → ENQUEUE(Request_
- D → DEQUEUE() → DEQUEUE() Which request is currently at the FRONT of the queue after all operations?
Solution
Queue follows FIFO (First In, First Out) — the element added first is removed first. Tracing each operation: ENQUEUE(A) → Queue: [A] (front=A, rear=A) ENQUEUE(B) → Queue: [A, B] (front=A, rear=B) ENQUEUE(C) → Queue: [A, B, C] (front=A, rear=C) DEQUEUE() → Removes A (front). Queue: [B, C] (front=B) ENQUEUE(D) → Queue: [B, C, D] (front=B, rear=D) DEQUEUE() → Removes B (front). Queue: [C, D] (front=C) DEQUEUE() → Removes C (front). Queue: [D] (front=D) Final state: Queue = [D]. Front = Request_D.Â
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