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queue using linked list.cpp
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#include<iostream>
#include<cstdlib>
using namespace std;
struct node{
int info;
struct node *next;
};
class Queue{
private:
node *rear;
node *front;
public:
Queue();
void enqueue();
void dequeue();
void display();
};
Queue::Queue(){
rear = NULL;
front = NULL;
}
void Queue::enqueue(){
int data;
node *temp = new node;
cout<<"Enter the data to enqueue: ";
cin>>data;
temp->info = data;
temp->next = NULL;
if(front == NULL){
front = temp;
}
else
{
rear->next = temp;
}
rear = temp;
}
void Queue::dequeue(){
node *temp = new node;
if(front == NULL){
cout<<"\nQueue is Emtpty\n";
}
else
{
temp = front;
front = front->next;
cout<<"The data Dequeued is "<<temp->info;
delete temp;
}
}
void Queue::display(){
node *p = new node;
p = front;
if(front == NULL){
cout<<"\nNothing to Display\n";
}
else
{
while(p!=NULL){
cout<<endl<<p->info;
p = p->next;
}
}
}
int main(){
Queue queue;
int choice;
while(true){
cout<<"\n1.Enqueue\n2. Dequeue\n3. Display\n 4.Quit";
cout<<"\nEnter your choice: ";
cin>>choice;
switch(choice){
case 1:
queue.enqueue();
break;
case 2:
queue.dequeue();
break;
case 3:
queue.display();
break;
case 4:
exit(0);
break;
default:
cout<<"\nInvalid Input. Try again! \n";
break;
}
}
return 0;
}