Circular Queue Using Arrays

/*******************************************************************************/
#include <stdio.h>
#include<stdlib.h>
#include <stdbool.h>
#define MAX 10
// initilazing queue
int cqueue[MAX];
int rear = - 1;
int front = -1;
// Function to check if the cqueue is empty
bool isEmpty() {
    return front==-1 ;
}

// Function to check if the cqueue is full
bool isFull() {
    return (rear+1)%MAX == front;
}

void insert() // enqueue
{
int item;
if (isFull())
  printf("Queue Overflow \n");
else
 {
 printf("\nInset the element in queue : ");
 scanf("%d", &item);
    if(isEmpty())
       front=rear=0;
    else
      rear = (rear + 1)%MAX;
 cqueue[rear] = item;
 }
} /*End of insert()*/
void delete() //dequeue
{
     if(isEmpty())
     {
       printf("\nQueue Underflow \n");
       return ;
     }
     printf("\nElement deleted from queue is : %d\n", cqueue[front]);
    
if ( rear == front )
    {
    front=rear=-1;//make it empty
    }
    else
    {
    front = (front + 1) %MAX;
    }
} /*End of delete() */
void display()// print queue
{
int i;
    if (isEmpty() )
        printf("\nQueue is empty \n");
     else
    {  printf("\nQueue is : ");
        if(front==rear)
            printf("%d\n", cqueue[front]);
        else
        {
        for (i = front; i != rear; i=(i+1)%MAX)
            printf("%d ", cqueue[i]);
        
        printf("%d ", cqueue[i]); //print the element at rear
        printf("\n");
        }
    }
}
// Function to peek at the front item
int peek() {
    if (isEmpty()) {
        printf("Queue is empty. Nothing to peek.\n");
        return -1; // Error value
    } else {
        return cqueue[front];
    }
}
// Function to get the size of the queue
int size() {
    if (isEmpty()) {
        return 0;
    } else {
        if (rear >= front ) return rear - front + 1;
        else return MAX-front+rear-0+1;
    }
}
int main()
{
int choice;
while (1)
{
printf("\n1.Insert element to queue \n");
printf("2.Delete element from queue \n");
printf("3.Display all elements of queue \n");
printf("4.Peek \n");
printf("5.Size of the queue\n");
printf("6.Quit \n");
printf("\nEnter your choice : ");
scanf("%d", &choice);
switch (choice)
{
case 1:
    insert();
    break;
case 2:
    delete();
    break;
case 3:
    display();
    break;
case 4:
    int x=peek();
    if(x!=-1) printf("\nfront element is=%d\n",x);
    break;
case 5:
    printf("\nsize of the queue is =%d\n",size());
    break;
case 6:
    exit(1);

default:

printf("\nWrong choice \n");

} /*End of switch*/

} /*End of while*/
return 0;
} /*End of main()*/

Comments

Post a Comment

Popular posts from this blog

Data Structure Lab CSL 201 Manual KTU - Dr Binu V P-9847390760

 Dr Binu V P - About Me Data Structures CST 201 KTU Theory Notes  ( Learn Theory Before You Attempt Lab Exercise) SCHEME AND SYLLABUS 1. Polynomial Addition using Arrays 2. Sparse Matrix Representation and sum 3. Stack using Array 4. Queue using Array 5. Circular Queue using Arrays 6. Double Ended Queue  7. Priority Queue  8. Infix to postfix 9. Infix to prefix conversion 10. Prefix to infix conversion 11. Evaluation of postfix expression 12. Singly Linked List 13. Doubly Linked List   14. Stack using Linked List 15. Queue using Linked List 16. Polynomial Addition using Linked list 17. Polynomial Multiplication using Linked List 18. Binary Tree using arrays and traversals 19. Binary Tree using Linked List and Traversal 20. Binary Search Tree Implementation and Traversal 21.Sorting Algorithms       Bubble sort       Exchange sort       Selection Sort       Insertion Sort       Quick Sort ...
Read more

Singly Linked List Implementation

Singly Linked List /**************************************************************************/ #include<stdio.h> #include<stdlib.h> struct Node {  int data;  struct Node *next; }*head=NULL,*tail=NULL,*temp=NULL,*trav=NULL,*prev=NULL; void create() {  temp=(struct Node*)malloc(sizeof(struct Node));  printf("Enter data:");  scanf("%d",&temp->data);  temp->next=NULL;  if(head==NULL)  {   head=temp;   tail=temp;  }  else  {   tail->next=temp;   tail=temp;  } } void display() {  temp=head;  while(temp!=NULL)  {   printf(" %d---->",temp->data);   temp=temp->next;  }  printf(" NULL"); }  void insert_begin()  {      temp=(struct Node*)malloc(sizeof(struct Node));      printf("Enter data:");      scanf("%d",&temp->data);      temp->next=NULL;      if(head...
Read more

Binary search Tree Implementation and Traversal

Binary Search Tree and Operations /******* BST Tree and Operations **********/ #include <stdio.h> #include <stdlib.h>struct Node { int key; struct Node* left; struct Node* right; }; struct Node *root=NULL,*temp=NULL; struct Node* createNode(int key) {      struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));      newNode->key = key;      newNode->left = newNode->right = NULL;      return newNode; } struct Node* insert(struct Node* node, int key) { // Base case: if the tree is empty, create a new node if (node == NULL) {      return createNode(key);      } // Compare the key with the current node's key if (key < node->key) { // Recursively insert into the left subtree      node->left = insert(node->left, key);      } else if (key > node->key) { // Recursively insert into the right subtree    node->...
Read more