What is a Queue?

Data Structure > Queue Data Structure > Queue Introduction

Short Question

923

Answer:

A queue is a data structure used for storing data (similar to Linked Lists and Stacks). In queue, the order in which data arrives is important. In general, a queue is a line of people or things waiting to be served in sequential order starting at the beginning of the line or sequence.
Definition: A queue is an ordered list in which insertions are done at one end (rear) and deletions are done at other end (front). The first element to be inserted is the first one to be deleted. Hence, it is called First in First out (FIFO) or Last in Last out (LILO) list.
Similar to Stacks, special names are given to the two changes that can be made to a queue. When an element is inserted in a queue, the concept is called EnQueue, and when an element is removed from the queue, the concept is called DeQueue.
DeQueueing an empty queue is called underflow and EnQueuing an element in a full queue is called overflow. Generally, we treat them as exceptions. As an example, consider the snapshot of the queue.

A queue is a linear data structure that follows the "first-in, first-out" (FIFO) principle. This means that the first item to be added to the queue will be the first item to be removed from the queue. Think of a queue as a line at a store, where the first person in line is the first person to be helped by the cashier. Queues can be implemented using various data structures such as arrays, linked lists, and circular buffers. They can be used in a wide variety of applications, such as scheduling tasks, maintaining communication buffers, and handling user requests in a system.

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552. Applications of stack

# Tutorial: Stack Data Structure Introduction

Question: Stack Data Structure Long

553. What is Data Structure?

Answer:

A data structure is an arrangement of data in a computer's memory or even disk storage. It has a different way of storing and organizing data in a computer so that it can used efficiently. Different kind of Data structure is used in different application. For example, B-tree is widely used in implementation of databases.

Examples of Data Structure?

Data structures are a way of organizing and storing data in a computer's memory or storage space. There are many types of data structures, each with its own set of advantages and disadvantages depending on the specific application. Here are some common examples of data structures:

Arrays: Arrays are a collection of elements of the same data type. They are used to store a fixed-size sequential collection of elements.
Linked Lists: Linked lists are a data structure in which each element contains a reference to the next element in the list. They are used to store a collection of elements that can be added or removed dynamically.
Stacks: Stacks are a data structure in which elements are added and removed from the top. They are used to implement functions such as recursion and backtracking.
Queues: Queues are a data structure in which elements are added at one end and removed from the other. They are used in various applications such as scheduling and buffering.
Trees: Trees are a hierarchical data structure in which each node has one parent and zero or more children. They are used in many applications such as sorting, searching, and data compression.
Graphs: Graphs are a data structure in which nodes are connected by edges. They are used in many applications such as social networks, routing, and scheduling.

Overall, data structures play a crucial role in computer science and programming by providing efficient ways to store, access, and manipulate data.

# Tutorial: What is Data Structure

Question: Data Structure Introduction Short

554. Name different type of data structures?

Answer:

There are basically two types of data structures
1 Linear data Structure
2 Non Linear data Structure

# Tutorial: Various Data structures

Question: Data Structure Introduction Short

555. What is Linear data Structure?

Answer:

Linear data structure organizes their elements in a linear fashion, where data elements are attached one after another. They are organized in a way similar to how the computer's memory is organized.

1) To have the linear relationship between the elements represented by means of sequential memory locations. For Example- ARRAY

2) To have the linear relationship between the elements represented by means of pointers and links. For Example- LINKED-LIST

# Tutorial: Various Data structures

Question: Data Structure Introduction Short

556. What is Non-Linear Data Structure?

Answer:

Non-linear data structure is a type of data structure in which the data elements are not arranged in a sequential manner. In other words, the elements are not stored in a linear or sequential manner and do not follow a specific order. Non-linear data structures are used when data elements have a hierarchical relationship and there is a need to represent the relationship between the elements.

Some examples of non-linear data structures are:

Trees: Trees are a hierarchical data structure where each node has a parent and zero or more children.
Graphs: Graphs are a collection of nodes and edges that connect them. Graphs can be used to represent complex systems such as social networks, transportation networks, and computer networks.
Heaps: Heaps are a type of binary tree used to implement priority queues.

Non-linear data structures are commonly used in various fields such as computer science, engineering, mathematics, and natural sciences. They allow for efficient representation of complex relationships between data elements, making them an essential tool in various applications.

# Tutorial: Various Data structures

Question: Data Structure Introduction Short

557. What is an Array?

Answer:

An Array can be defined as a data structure having fixed size sequenced collection of elements of same data type and which can be referenced through the same variable name. An Array is a name given to a group of similar quantities.

Declaring an array

Type variable_name [length of array];

For example:-

double height[10];
float width[20];
int min[9];
int myArray[5] = {1, 2, 3, 4, 5}; //declare and initialize the array in one statement

In C language array starts at position 0. C language treats array name as the pointer to the first element and an item in the array can be accessed through its index.

# Tutorial: Array Introduction in Data Structure

Question: Array Short

558. How to read and write data in an array?

Answer:

In this section you will learn how to read and write data in an array using c programming Language


#include<stdio.h>
void main ()
{
int array[10], n;
// Reading an array
printf("Enter size of an array");
scanf ("%d", &n);
printf("Enter array elements");
for (i=0;i<n;i++)
scanf ("%d", &array[i]);
// writing an array
printf("array elements are");
for (i=0;i<n;i++)
printf ("%d", array[i]);
}

# Tutorial: Array Introduction in Data Structure

Question: Array Short

559. How to insert data in an array at a particular position?

Answer:

To insert a value into an array, you need to shift every value after the location you want to insert. the logic is very simple: start from the end and copy the previous item to the current element until you hit the location you want to insert.

# Tutorial: Array Introduction in Data Structure

Question: Array Short

560. Write code to insert data in an array at a particular position

Answer:



#include<stdio.h>
Void main ()
{
int array [10], n elem, pos;
// Reading an array
printf (                  </div>
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                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
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                                   <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>  
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              <a href="/qanswer/how-to-delete-an-element-from-a-specified-position-from-an-array-question/54/561">
                  <h5 class="mb-1" style="color:#194757;">561. &nbsp;How to delete an element from a specified position from an array?</h5>
              </a>
            </div>
                            <div class="card">
                  <div class="card-body">
                     Answer: <p> To delete a value from an array, you need to shift every value after the
location you want to delete. The logic is very simple: start from the position
you want to delete and copy the previous item to the current element until
end of the array.</p>                  </div>
                </div>
                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
            </a>
                                   <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>  
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