C++ Program to Implement Queue using Linked List

This C++ program, using iteration, implements the list of elements removed from the queue in first in first out mode using a linked list. A linked list is an ordered set of data elements, each containing a link to its successor.

Here is the source code of the C program to display the list of elements removed from the queue. The C++ program is successfully compiled and run on DevCpp, a C++ compiler. The program output is also shown below.

```
/*
```

 * C++ Program to Implement Queue using Linked List

```
 */
```
```
#include<iostream>
```
```
#include<stdio.h>
```
```
#include<conio.h>
```
```
using namespace std;
```
```
struct node
```
```
{
```
```
    int data;
```
```
    node *next;
```

}*front = NULL,*rear = NULL,*p = NULL,*np = NULL;

```
void push(int x)
```
```
{
```
```
    np = new node;
```
```
    np->data = x;
```
```
    np->next = NULL;
```
```
    if(front == NULL)
```
```
    {
```
```
        front = rear = np;
```
```
        rear->next = NULL;
```
```
    }
```
```
    else
```
```
    {
```
```
        rear->next = np;
```
```
        rear = np;
```
```
        rear->next = NULL;
```
```
    }
```
```
}
```
```
int remove()
```
```
{
```
```
    int x;
```
```
    if(front == NULL)
```
```
    {
```
```
        cout<<"empty queue\n";
```
```
    }
```
```
    else
```
```
    {
```
```
        p = front;
```
```
        x = p->data;
```
```
        front = front->next;
```
```
        delete(p);
```
```
        return(x);
```
```
    }
```
```
}
```
```
int main()
```
```
{
```
```
    int n,c = 0,x;
```

    cout<<"Enter the number of values to be pushed into queue\n";

```
    cin>>n;
```
```
    while (c < n)
```
```
    {
```

	cout<<"Enter the value to be entered into queue\n";

```
	cin>>x;
```
```
        push(x);
```
```
        c++;
```
```
     }
```
```
     cout<<"\n\nRemoved Values\n\n";
```
```
     while(true)
```
```
     {
```
```
        if (front != NULL)
```
```
            cout<<remove()<<endl;
```
```
        else
```
```
            break;
```
```
     }
```
```
     getch();
```
```
}
```

Output
Enter the number of values to be pushed into queue
6
Enter the value to be entered into queue
5
Enter the value to be entered into queue
4
Enter the value to be entered into queue
3
Enter the value to be entered into queue
2
Enter the value to be entered into queue
1
Enter the value to be entered into queue
0
 
 
Removed Values
 
5
4
3
2
1
0

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