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Chapter 18: Problem 8

When an element is added to a queue, where is it added?

Short Answer

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Question: Explain the process of adding an element to a queue and where the element is added. Answer: When an element is added to a queue, it is added at the back (rear) of the queue, following the First In, First Out (FIFO) principle. This process is called the enqueue operation. After adding the element, the rear pointer is updated to point to the newly added element. If the queue was empty before the enqueue operation, the front pointer is also updated to point to the new element.

Step by step solution

01

Introduction

A queue is a data structure that works on the First In, First Out (FIFO) principle. This means that the element that is added first will be removed first. In a queue, elements are added at the back (called rear) and removed from the front (called front).
02

Enqueue operation

When an element is added to a queue, it is added to the back of the queue. This process is called the enqueue operation. To perform this operation, we need to maintain a pointer called rear pointing to the last element of the queue.
03

Update pointers

After an element is added, we need to update the rear pointer to point to the newly added element. Also, if the queue was empty before the enqueue operation, we have to update the front pointer to point to the new element as well.
04

Enqueue operation example

Let's consider the following example, where we enqueue elements A, B, and C to an empty queue Q. 1. Enqueue element A: * The element A is added at the rear of the empty queue Q. * Both front and rear pointers are updated to point to element A. 2. Enqueue element B: * The element B is added at the rear of the queue Q, after element A. * The rear pointer is updated to point to element B. 3. Enqueue element C: * The element C is added at the rear of the queue Q, after element B. * The rear pointer is updated to point to element C. After these operations, the queue Q looks like this: Front (A) -> B -> C (Rear)
05

Conclusion

When an element is added to a queue, it is added at the back (rear) of the queue, following the First In, First Out (FIFO) principle. The pointers front and rear are updated accordingly to maintain the correct order of elements in the queue.

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Most popular questions from this chapter

What is the difference between a static stack and a dynamic stack?

A common real-life example used to explain stacks is the stack of plates in a cafeteria. Find at least two other real-life examples in which items are added and removed from a container in last-in-first-out order, and use these examples to explain the concept of a stack.

The STL stack is considered a container adapter. What does that mean?

Give pseudocode that implements a queue using two stacks. The queue operations enqueue, dequeue, and empty must be implemented in terms of the push , pop and empty stack operations.

Suppose the following operations were performed on an empty stack: push (0): push (9): push (12): push (1) Insert numbers in the following diagram to show what will be stored in the static stack after the operations have executed.
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