Simple C++ program for hotel billing:

Here's a simple C++ program for hotel billing:

#include <iostream>

#include <string>

using namespace std;

class HotelBilling {

private:

    string customerName;

    int roomNumber;

    int numberOfDays;

    double roomRate;

    double foodBill;

    double totalBill;

public:

    void inputDetails() {

        cout << "Enter customer name: ";

        getline(cin, customerName);

        cout << "Enter room number: ";

        cin >> roomNumber;

        cout << "Enter number of days stayed: ";

        cin >> numberOfDays;

        cout << "Enter room rate per day: ";

        cin >> roomRate;

        cout << "Enter food bill: ";

        cin >> foodBill;

    }

    void calculateBill() {

        totalBill = (roomRate * numberOfDays) + foodBill;

    }

    void displayBill() {

        cout << "\nHotel Bill\n";

        cout << "Customer Name: " << customerName << endl;

        cout << "Room Number: " << roomNumber << endl;

        cout << "Number of Days Stayed: " << numberOfDays << endl;

        cout << "Room Rate per Day: " << roomRate << endl;

        cout << "Food Bill: " << foodBill << endl;

        cout << "Total Bill: " << totalBill << endl;

    }

};

int main() {

    HotelBilling billing;

    billing.inputDetails();

    billing.calculateBill();

    billing.displayBill();

    return 0;

}

```

*Example Output:*

```

Enter customer name: John Doe

Enter room number: 101

Enter number of days stayed: 3

Enter room rate per day: 500

Enter food bill: 200

Hotel Bill

Customer Name: John Doe

Room Number: 101

Number of Days Stayed: 3

Room Rate per Day: 500

Food Bill: 200

Total Bill: 1700

This program defines a `HotelBilling` class with private member variables for customer details, room information, and billing data. The class includes public methods for inputting customer details, calculating the total bill, and displaying the hotel bill.

In the `main()` function, an instance of the `HotelBilling` class is created, and the program prompts the user to input customer details. The program then calculates the total bill and displays the hotel bill with the calculated total.