Method to add an element in circular queue, Data Structure & Algorithms

Q. Let us consider a queue is housed in an array in circular fashion or trend. It is required to add new items to the queue. Write down a method ENQ to achieve this also check whether the queue is full. Write down another procedure DQ to delete an element after checking queue empty status.  

Ans.

The Method To Add an element in Circular Queue

# define  MAXQUEUE 100 struct queue{

int items[MAXQUEUE];

int front, rear;

}

struct queue q;

q.front=q.rear=MAXQUEUE -1;

void ENQ(struct queue *pq, int x)

{

/* make room for new element*/

if(pq ->rear = MAXQUEUE - 1)

pq-> rear = 0;

else

(pq->rear)++;

/* check for overflow */

if(pq ->rear==pq->front)

{

printf("queue overflow);

exit(1);

}

pq->items[pq->rear]=x;

return;

}/* end of ENQ*/

A Method to Delete an element from Circular Queue

int DQ(struct queue *pq)

{

if(pq-> rear == pq-> front)

{

printf("queue underflow");

exit(1);

}/*end if*/

if(pq->front = = MAXQUEUE-1)

pq->front=0;

else

(pq->front)++;

return(pq->items[pq->front]);

}/*end DQ*/

Posted Date: 7/12/2012 9:16:50 AM | Location : United States







Related Discussions:- Method to add an element in circular queue, Assignment Help, Ask Question on Method to add an element in circular queue, Get Answer, Expert's Help, Method to add an element in circular queue Discussions

Write discussion on Method to add an element in circular queue
Your posts are moderated
Related Questions
#question bubble sort..

AVL tree An AVL tree is a binary search tree in which the height of the left and right subtree of the root vary by at most 1 and in which the left and right subtrees are again

Comparison of Gouraud and Phong Shading Phong shading requires more calculations, but produces better results for specular reflection than Gouraud shading in the form of more r

Create a Money data structure that is made up of amount and currency. (a) Write a constructor for this data structure (b) Create accessors for this data structure (c) Writ

Let G=(V,E) be a graph for which all nodes have degree 5 and where G is 5-edge is connected. a) Show that the vector x which is indexed by the edges E and for which xe = 1/5 for

Polynomials like  5x 4    +  2x 3    +  7x 2     +  10x  -  8  can  be  represented by using arrays. Arithmetic operations such as addition & multiplication of polynomials are com

Write the algorithm for compound interest

Ans: I nsertion into the B-tree: 1.  First search is made for the place where the new record must be positioned. As soon as the keys are inserted, they are sorted into th

There are ten stations on a railway line: Train travels in both directions (i.e. from 1 to 10 and then from 10 to 1).  Fare between each station is $2. A passenger input

Explain the bubble sort algorithm. Answer This algorithm is used for sorting a list. It makes use of a temporary variable for swapping. It compares two numbers at an insta