Destructor in Constructor in c++?

Question

I am coding a ticket Reservation System I was just planning to how to code it The problem which I am confronting is a little bit tricky. My Requirements are:

• A bus consists of only 100 bookings at a time.
• if exceeded more than 100 then no booking may reserve.

Now the problem I am facing is I am not getting a logic not to book a ticket for a passenger when the limit is exceeded. And shift its reservation to the next bus automatically.

Here is the code which I have done till yet.

#include<iostream>
using namespace std;
class BUS {
int SOD = 6;
int EOD = 22;
int capacity=0;
int BUS_NO;
public:
BUS(int no) :BUS_NO(no) {
    if (capacity == 100) {
        cout << "Capacity is Full\n";
        return;
    }
    else {
            if (capacity != 100) 
                capacity++;
    }
}
int bus_No() { return BUS_NO; }
void routes() {
    cout << "=========================================\n";
    cout << "1.Saddar " << "2.Marrir Chowk\n";
    cout << "3.Liaquat Bagh " << "4.Committe Chowk\n";
    cout << "5.waris Chowk " << "6.Chandni Chowk\n";
    cout << "7.Rehman " << "8.6th Road\n";
    cout << "9.Shamsabad " << "10.Faizabad\n";
    cout << "11.Pothar " << "12.Khayan e Johar\n";
    cout << "11.Pothar " << "12.Khayan e Johar\n";
    cout << "13.Faiz Ahmad Road " << "14.Kashmir Highway\n";
    cout << "15.Chaman " << "16.Ibn e Sina\n";
    cout << "=========================================\n";
}
void reserveTicket() {
    if (capacity != 100) capacity++;
    else cout << "Wait for Next Bus plzz! This is full.\n";
}
};
class PASSENG {

};

Answer 1

During writing this answer, I am considering that we have infinite number of buses available. Now we 3 function. 1.> ticket_book(int n) => This function will book ticket for the number of passengers we want. If number of passengers increases then automatically it will book ticket in next available bus. 2.> get_bus_capacity() => This function will return currently available seats in current bus. 3.> get_bus_number() => This function will return the current bus number.

#include<iostream>
using namespace std;
class BUS {
int SOD = 6;
int EOD = 22;
int capacity=0;
int BUS_NO = 1;
public:
void book_ticket(int n)
{
    if(capacity + n <= 100)
    {
        capacity += n;
    }
    else
    {
        int cur_bus_seat = 100 - capacity;
        int next_bus_seat = capacity + n - 100;
        capacity = next_bus_seat;
        BUS_NO += 1;
    }
}
int get_bus_capacity()
{
    return 100 - capacity;
}
int get_bus_no()
{
    return BUS_NO;
}
void routes() {
    cout << "=========================================\n";
    cout << "1.Saddar " << "2.Marrir Chowk\n";
    cout << "3.Liaquat Bagh " << "4.Committe Chowk\n";
    cout << "5.waris Chowk " << "6.Chandni Chowk\n";
    cout << "7.Rehman " << "8.6th Road\n";
    cout << "9.Shamsabad " << "10.Faizabad\n";
    cout << "11.Pothar " << "12.Khayan e Johar\n";
    cout << "11.Pothar " << "12.Khayan e Johar\n";
    cout << "13.Faiz Ahmad Road " << "14.Kashmir Highway\n";
    cout << "15.Chaman " << "16.Ibn e Sina\n";
    cout << "=========================================\n";
}
};
class PASSENG {

};


int main()
{
    BUS bus;
    int n;
    
    while(1)
    {
        int choice;
        cout<<"Enter Your Choice"<<"\n";
        cout<<"Enter 1 to book ticket"<<"\n";
        cout<<"Enter 2 to check number of seats"<<"\n";
        cout<<"Enter 3 to check Bus No"<<"\n";
        cin>>choice;
        if(choice == 1)
        {
            cout<<"Enter the number of tickets to be booked";
            cin>>n;
            bus.book_ticket(n);
        }
        else if(choice == 2)
        {
            cout<<bus.get_bus_capacity()<<"\n";
        }
        else if(choice == 3)
        {
            cout<<bus.get_bus_no()<<"\n";
        }

    }
    return 0;
}