Array implementation of a queue, Data Structure & Algorithms

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Since the stack is list of elements, the queue is also a list of elements. The stack & the queue differ just in the position where the elements may be added or deleted. Similar to other liner data structures, queues can also be implemented by using arrays. Program 1 lists the implementation of a queue by using arrays.

Program: Array implementation of any Queue

include "stdio.h"

define QUEUE_LENGTH 50

struct queue

{     int element[QUEUE_LENGTH];

int front, rear, choice,x,y;

}

struct queue q;

main()

{

int choice,x;

printf ("enter 1 for add and 2 to eliminate element front the queue")

printf("Enter your alternative")

scanf("%d",&choice);

switch (choice)

{

case 1 :

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

scanf("%d",&x);

add(&q,x);

break;

case 2 :

delete();

 break;

}

}

add(y)

{

++q.rear;

if (q.rear < QUEUE_LENGTH)

q.element[q.rear] = y;

else

printf("Queue overflow")

}

delete()

{

if q.front > q.rear printf("Queue empty");

else{

x = q.element[q.front];

q.front++;

}

retrun x;

}


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