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- #include <iostream>
- #include <stdlib.h>
- using namespace std;
- struct node {
- int data;
- struct node *next;
- };
- struct node* front = NULL;
- struct node* rear = NULL;
- struct node* temp;
- void Insert() {
- int val;
- cout<<"Insert the element in queue : "<<endl;
- cin>>val;
- if (rear == NULL) {
- rear = (struct node *)malloc(sizeof(struct node));
- rear->next = NULL;
- rear->data = val;
- front = rear;
- } else {
- temp=(struct node *)malloc(sizeof(struct node));
- rear->next = temp;
- temp->data = val;
- temp->next = NULL;
- rear = temp;
- }
- }
- void Delete() {
- temp = front;
- if (front == NULL) {
- cout<<"Underflow"<<endl;
- return;
- }
- else
- if (temp->next != NULL) {
- temp = temp->next;
- cout<<"Element deleted from queue is : "<<front->data<<endl;
- free(front);
- front = temp;
- } else {
- cout<<"Element deleted from queue is : "<<front->data<<endl;
- free(front);
- front = NULL;
- rear = NULL;
- }
- }
- void Display() {
- temp = front;
- if ((front == NULL) && (rear == NULL)) {
- cout<<"Queue is empty"<<endl;
- return;
- }
- cout<<"Queue elements are: ";
- while (temp != NULL) {
- cout<<temp->data<<" ";
- temp = temp->next;
- }
- cout<<endl;
- }
- int main() {
- int ch;
- cout<<"1) Insert element to queue"<<endl;
- cout<<"2) Delete element from queue"<<endl;
- cout<<"3) Display all the elements of queue"<<endl;
- cout<<"4) Exit"<<endl;
- do {
- cout<<"Enter your choice : "<<endl;
- cin>>ch;
- switch (ch) {
- case 1: Insert();
- break;
- case 2: Delete();
- break;
- case 3: Display();
- break;
- case 4: cout<<"Exit"<<endl;
- break;
- default: cout<<"Invalid choice"<<endl;
- }
- } while(ch!=4);
- return 0;
- }
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