myQueue[QueueOperations]

#include <iostream>
#include <cstdlib>
using namespace std;

struct myQueue {
    int data = 0;
    myQueue *next = NULL;
} *Head;

int counT() {
    int c = 0;
    for (myQueue *Current = Head; Current != NULL; Current = Current -> next)
        c++;
    return c;
}

void display() {
    if (Head == NULL)
        cout << "Queue is Empty, Nothing to Display.";
    else
        for (myQueue *Current = Head; Current != NULL; Current = Current -> next)
            cout << Current -> data << " ";
    cout << endl << endl;
}

void enqueue(int num) {
    myQueue *Current = Head;
    myQueue *temp = new myQueue;
    temp -> data = num;
    temp -> next = NULL;

    if (Head == NULL)
        Head = temp;
    else {
        while (Current -> next != NULL)
            Current = Current -> next;
        Current -> next = temp;
    }
}

void dequeue() {
    if (Head == NULL)
        cout << "Queue is Empty, Nothing to Dequeue." << endl;
    else {
        myQueue *temp = Head;
        Head = Head -> next;
        delete temp;
    }
    cout << endl;
}

int main() {
    int choice, data;

    while (true) {
        cout << "Queue Operations" << endl;
        cout << "----------------" << endl;
        cout << "1. En-Queue" << endl;
        cout << "2. De-Queue" << endl;
        cout << "3. Display" << endl;
        cout << "4. Size" << endl;
        cout << "5. Exit" << endl;
        cout << " --Choice: ";
        cin >> choice;

        switch (choice) {
            case 1: {
                cout << "Enter the Integer Value: ";
                cin >> data;
                cout << endl;
                enqueue(data);
                break;
            }
            case 2: {
                dequeue();
                break;
            }
            case 3: {
                display();
                break;
            }
            case 4: {
                cout << "Size: " << counT() << endl << endl;
                break;
            }
            case 5:
                exit(0);
            default:
                cout << "Invalid Choice, Try Again." << endl << endl;
        }

    }
    return 0;
}