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Chapter 18: Problem 10

When an element is removed from a queue, where is it removed from?

Short Answer

Expert verified
**Answer**: The main characteristic of a queue data structure is its adherence to the First In First Out (FIFO) principle, meaning the element that enters first is the one that gets removed first. In a queue, elements are removed from the front during a dequeue operation.

Step by step solution

01

Introduction to Queue Data Structure

A queue is a linear data structure that follows the First In First Out (FIFO) principle, which means that the element that enters first is the one that gets removed first. It has two main operations: enqueue (adding an element to the end of the queue) and dequeue (removing an element from the front of the queue). Think of a queue like a real-life queue or line, such as standing in line at a grocery store checkout.
02

The dequeue operation: Removing Elements from a Queue

When an element is removed from a queue, it is removed from the front. The front is the position where the first element was added to the queue and has been waiting the longest to be removed. Now, let's illustrate this with an example.
03

Example: Removing Elements from a Queue

Suppose we have a queue containing the following elements: [10, 20, 30, 40, 50]. The element at the front is 10, and the element at the rear is 50. When a dequeue operation is performed, the element that gets removed is the one at the front: 1. Dequeue operation: Remove 10 (front element) New queue: [20, 30, 40, 50] 2. Dequeue operation: Remove 20 (front element) New queue: [30, 40, 50] As illustrated, dequeue operations remove elements from the front of the queue, maintaining the FIFO principle.

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Most popular questions from this chapter

Suppose the following operations are performed on an empty queue: enqueue(5); enqueue(7); dequeue(); enqueue(9); enqueue(12); dequeue(); enqueue(10); Insert numbers in the following diagram to show what will be stored in the static stack after the operations above have executed.

What does FIFO mean?

__________ stacks and queues are implemented as linked lists.

T F A static stack or queue is built around an array.

The __________ element saved in a queue is the first one retrieved.
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