Array implementation of a dequeue, Data Structure & Algorithms

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If a Dequeue is implemented via arrays, then this will suffer with the similar problems which a linear queue had suffered. Program 8 gives the array implementation of Dequeue.

Program: Array implementation of a Dequeue

#include "stdio.h"

#define QUEUE_LENGTH 10;

int dq[QUEUE_LENGTH];

 int front, rear, choice,x,y;

 main()

{

int choice,x;

front = rear = -1; /* initialize the front and rear to null i.e empty queue */

printf ("enter 1 for insertion of any element and 2 for eliminate element from the front of the queue");

printf ("enter 3 to add needed element  and 4 for  eliminate element from the rear of the queue"); printf("Enter your option");

scanf("%d",&choice);

switch (choice)

{

case 1:

printf ("Enter element to be added :");

scanf("%d",&x);

add_front(x);

break;

case 2:

delete_front();

break;

case 3:

printf ("Enter any element to insertion :");

scanf("%d ",&x);

add_rear(x);

break;

case 4:

delete_rear();

break;

}

}

 

/**************** Insertion at the front ***************/

add_front(int y)

{

if (front == 0)

{

printf("At the front position element cannot be inserted ");

return;

else

{

front = front - 1;

dq[front] = y;

if (front == -1 ) front = 0;

}

}

/**************** Deletion from the front ***************/

delete_front()

{

if front == -1

printf("Queue empty");

 

else

return dq[front];

if (front = = rear)

front = rear = -1

else

front = front + 1;

 }

/**************** Insertion at the rear ***************/

add_rear(int y)

if (front == QUEUE_LENGTH -1 )

{

printf("At the rear , element cannot be inserted ")

return;

else

{

rear = rear + 1;

dq[rear] = y;

if (rear = = -1 )

rear = 0;

}

}

/**************** Delete at the rear ***************/

delete_rear()

{

if rear == -1

printf("deletion is not attainable at rear position");

else

{

if (front = = rear)

front = rear = -1

else

{

rear = rear - 1;

return dq[rear];

}

}

}


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