#include <iostream>
#include <exception>
#include <string>
using namespace std;
class UserException : public exception {
    private:
        string msg; 
    public:
       
        UserException (string m) {
            msg = m;
        }
       
        virtual const char* what () const throw () {
            return msg.c_str ();
        }
};


class User {
    protected:
        int age; 
        int income;
        string city; 
        bool vehicle; 
    public:
       
        User (int a, int i, string c, bool v) {
            age = a;
            income = i;
            city = c;
            vehicle = v;
        }
        
        virtual void check () {
            // check age
            if (age < 18 || age > 55) {
                throw UserException ("Invalid age: " + to_string (age));
            }
          
            if (income < 50000 || income > 100000) {
                throw UserException ("Invalid income: " + to_string (income));
            }
            
            if (city != "Pune" && city != "Mumbai" && city != "Bangalore" && city != "Chennai") {
                throw UserException ("Invalid city: " + city);
            }if (!vehicle) {
                throw UserException ("User does not have a 4-wheeler");
            }
        }
};


class PremiumUser : public User {
    public:
      
        PremiumUser (int a, int i, string c, bool v) : User (a, i, c, v) {}
       
        void check () override {
          
            User::check ();
           
            if (income < 75000) {
                throw UserException ("Premium user must have an income of at least Rs. 75,000");
            }
        }
};


int main () {
    User* u;
    u = new User (25, 60000, "Pune", true);
    try {
        u->check ();
        cout << "User is valid\n";
    }
    catch (UserException& e) {
        cout << "User is invalid: " << e.what () << "\n";
    }
    delete u;
    return 0;
}