Register the entrance of people in the auditorium using static class data using oops in c++

Sure, here is a simple example of how you can use a static class data member to register the entrance of people in an auditorium using OOP in C++.

#include <iostream>
using namespace std;

class Auditorium {
    static int count; // static data member
public:
    Auditorium() { // constructor
        count++;
    }
    static int getCount() { // static member function
        return count;
    }
};

int Auditorium::count = 0; // initialize static data member

int main() {
    cout << "Initial count: " << Auditorium::getCount() << endl;

    Auditorium person1;
    Auditorium person2;
    Auditorium person3;

    cout << "After 3 people enter, count: " << Auditorium::getCount() << endl;

    return 0;
}

In this code:

1. We declare a static data member count in the Auditorium class. This member will be shared by all objects of the class, so it can be used to count the total number of people (objects) created.

2. We define a constructor that increments count each time a new object is created.

3. We define a static member function getCount() that returns the current value of count.

4. In the main() function, we create three Auditorium objects (representing three people entering the auditorium), and then we print the value of count (which should be 3).

Remember that static data members need to be initialized outside the class, as shown in the line int Auditorium::count = 0;.