Web Reference: Oct 30, 2025 · A circular queue is a linear data structure that overcomes the limitations of a simple queue. In a normal array implementation, dequeue () can be O (n) or we may waste space. Using a circular array, both enqueue () and dequeue () can be done in O (1). Declaration using Array: Design your implementation of the circular queue. The circular queue is a linear data structure in which the operations are performed based on FIFO (First In First Out) principle, and the last position is connected back to the first position to make a circle. It is also called "Ring Buffer". Circular Queue works by the process of circular increment i.e. when we try to increment the pointer and we reach the end of the queue, we start from the beginning of the queue. Here, the circular increment is performed by modulo division with the queue size. That is,
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