Queue

Introduction to Queues

• Discusses a new type of data container called a queue.

• Contrasts with the previously discussed container, the stack.

Comparison to Stack

• In a stack, data retrieval (popping) happens in reverse order of data addition (pushing).

• The queue operates differently by adhering to a first-in-first-out (FIFO) principle.

Example of Data Retrieval

• Demonstration using four pieces of data (balls): ball one, ball two, ball three, ball four.

• When retrieving from the queue:

  • Retrieved in the order they were added: ball one, ball two, ball three, ball four.

Characteristics of a Queue

• Defined as a structured container with two open ends: one for adding data (enqueue) and one for retrieving data (dequeue).

• Enqueue: The process of adding data to the queue.

• Dequeue: The process of retrieving data from the queue.

• Preserves the order of data storage and retrieval.

FIFO Concept

• Emphasizes the first-in-first-out nature of queues:

  • First item added (enqueued) is the first item to be retrieved (dequeued).

• Important for maintaining the sequence of data as entered.

Applications of Queues in Computer Science

• Queues are crucial for handling data orderly which is foundational in various algorithmic solutions.

• Future lessons will explore practical examples of queues solving common problems.