car_rental_system.cpp

#include <bits/stdc++.h>
#include<fstream>
using namespace std;
// Below we have implemented function to calculate number of days between two given dates.
const int monthDays[12] = { 31, 59, 90, 120, 151, 181, 212, 243,
273, 304, 334, 365 };
int countLeapYearDays(int d[]){
   int years = d[2];
   if (d[1] <= 2)
      years--;
   return ( (years / 4) - (years / 100) + (years / 400) );
}

int countNoOfDays(int date1[], int date2[]){
   long int dayCount1 = (date1[2] * 365);
   dayCount1 += monthDays[date1[1]];
   dayCount1 += date1[0];
   dayCount1 += countLeapYearDays(date1);
   long int dayCount2 = (date2[2] * 365);
   dayCount2 += monthDays[date2[1]];
   dayCount2 += date2[0];
   dayCount2 += countLeapYearDays(date2);
   return ( abs(dayCount1 - dayCount2) );

}

class Car_db{
   private: 
   int car_no;
   int availaibility;
   string Car_name;
   int Car_rent_price;
   string rented_from;
   public :
   Car_db(int car_number, int availability_status, const std::string& car_name, int rent_price, const std::string& rented_source) 
         {
         car_no = car_number;
         availaibility = availability_status;
         Car_name = car_name;
         Car_rent_price = rent_price;
         rented_from = rented_source; 
    }
   string c_name(){
    return Car_name;
   }  
   string r_from(){
    return rented_from;
   }     
   int rent(){
    return Car_rent_price;
   }
   void update(int car_n, int new_rprice, string new_date){
    car_no = car_n;
    Car_rent_price = new_rprice;
    rented_from = new_date;
   }
   void delet(){
       availaibility = 0;
       Car_name = "";
       car_no = 0;
      Car_rent_price = 0;
       rented_from = "000000";
   }
   int av(){
    return availaibility; 
   }
   void setav(){
    availaibility = !availaibility;
   }
   void ch_rfrom(string date){
    rented_from = date;
   }
   
};

vector<Car_db> CARS;

class Customer_db{
   private:
   int id;
   string name;
   int Fine_dues;
   int Customer_Record;
   public : 
   vector<pair<int,string>> Return_dates;
   vector<int> cars_rented;
   Customer_db(int customer_id, const std::string& customer_name, const std::vector<int>& rented_cars,
                int fine_dues, int customer_record, const std::vector<std::pair<int, std::string>>& return_dates)
        {
         id = customer_id;
         name = customer_name;
         cars_rented = {};
         Fine_dues = fine_dues;
         Customer_Record = customer_record;
         Return_dates = {};

    }
   int size_rcars(){
    return cars_rented.size();
   } 
   int c_record(){
    return Customer_Record;
   }
   void ch_record(int val){
     Customer_Record -=val;
   }
   int c_rented(int ind){
    return cars_rented[ind];
   }
   void c_f_dues(int p){
    Fine_dues+=p;
   }
   int f_dues(){
    return Fine_dues;
   }
   int rd_size(){
    return Return_dates.size();
   }
   int ID(){
    return id;
   }
   void del(){
        name = "";
        Fine_dues = 0;
        cars_rented  = vector<int>();
        Customer_Record = 0;
        Return_dates = vector<pair<int,string>>();
   }
   string c_name(){
    return name;
   }
   string r2(int ind){
    return Return_dates[ind].second;
   }
   int r1(int ind){
    return Return_dates[ind].first;
   }
};
vector<Customer_db> CUSTOMER;

class Employee_db{
   private:
   int id;
   string name;
   float Fine_dues;
   int Employee_Record;
   public: 
   vector<int> cars_rented;
   vector<pair<int,string>> Return_dates;
   Employee_db(int e_id, const std::string& e_name, const std::vector<int>& rented_cars,
                int fine_dues, int e_record, const std::vector<std::pair<int, std::string>>& return_dates){
                id = e_id;
                name = e_name;
                cars_rented = {};
                Fine_dues = fine_dues;
                Employee_Record = e_record;
                Return_dates = {};  }
     int size_rcars(){
    return cars_rented.size();
   } 
   int e_record(){
    return Employee_Record;
   }
   void eh_record(int val){
     Employee_Record -=val;
   }
   int e_rented(int ind){
    return cars_rented[ind];
   }
   void e_f_dues(float p){
    Fine_dues+=p;
   }
   int e_dues(){
    return Fine_dues;
   }
   int rd_size(){
    return Return_dates.size();
   }
   int ID(){
    return id;
   }
   void del(){
        name = "";
        Fine_dues = 0;
        cars_rented  = vector<int>();
        Employee_Record = 0;
        Return_dates = vector<pair<int,string>>();
   }
   string e_name(){
    return name;
   }
   string r2(int ind){
    return Return_dates[ind].second;
   }
   int r1(int ind){
    return Return_dates[ind].first;
   }      

};

vector<Employee_db> EMPLOYEE;

class Customer{
 public:
    int id;
    void Rented_Cars( int id){

         std:: cout<<"You have rented "<<CUSTOMER[id].size_rcars()<<" cars\n";

          if(CUSTOMER[id].size_rcars()>0){
           std:: cout<<"The following are the names of the cars rented : \n";
            for(int index=0;index<CUSTOMER[id].size_rcars();index++){
                int car_id = CUSTOMER[id].c_rented(index);
               std:: cout<<index+1<<")"<<" "<<CARS[car_id].c_name()<<endl;
            }

          }    
    }
 public : 
    void Fine_dues( int id){
         int total_dues = 0;
        std:: cout<<"The following are your pending dues:\n";    
         if(CUSTOMER[id].rd_size()==0)std:: cout<<"Total pending dues to be paid: "<<CUSTOMER[id].f_dues()<<endl;
         else{
           total_dues = 0;
           for(int ind = 0; ind < CUSTOMER[id].rd_size(); ind++){
               int cr_id = CUSTOMER[id].r1(ind);
               string r_dt = CUSTOMER[id].r2(ind);
               string i_dt = CARS[cr_id].r_from();
               int date1[3] = {(i_dt[0]-'0')*10+(i_dt[1]-'0'), (i_dt[2]-'0')*10+(i_dt[3]-'0') , (i_dt[4]-'0')*10+(i_dt[5]-'0')  };
               int date2[3] = {(r_dt[0]-'0')*10+(r_dt[1]-'0'), (r_dt[2]-'0')*10+(r_dt[3]-'0') , (r_dt[4]-'0')*10+(r_dt[5]-'0')  };
               int rented_days = countNoOfDays(date1, date2);
               int this_price = CARS[cr_id].rent() * rented_days;
              std:: cout<<"Car Name : "<<CARS[cr_id].c_name()<<" Rent to be paid : "<<this_price<<endl;
               total_dues+=this_price;
           }
          std:: cout<<"Total dues to be paid: "<<total_dues + CUSTOMER[id].f_dues()<<endl;
         }
        CUSTOMER[id].c_f_dues(total_dues);
 }

    void see_cars(){
        int flag = 0;
        for(int car_num = 0; car_num < CARS.size(); car_num++){
          if(CARS[car_num].av()== 1)  {
           std:: cout<<"CAR_NUMBER = "<<car_num<<" CAR_NAME = "<<CARS[car_num].c_name()<<" RENT_PRICE = "<<CARS[car_num].rent()<<endl;
            flag++;
            }
        }
        if(flag==0)std:: cout<<"Sorry, No cars are availaible for now.";
        else std:: cout<<"These cars are availaible for renting.\n";

    }
    void rent_car(){
       std:: cout<<"Provide the number of the car you want to rent.\n";
        int car_no;
        std::cin>>car_no;
       std:: cout<<"This car has per day rental price "<<CARS[car_no].rent()<<endl;
       cout<<"To confirm Press 1 otherwise select other car press other digit.\n";
       int c;
       cin>>c;
       if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return ;
      }
      if(c==1){
        CARS[car_no].setav();
        CUSTOMER[id].cars_rented.push_back(car_no);
       std:: cout<<"Enter today's date in ddmmyy format.\n";
        string date;
        std::cin>>date;
        CARS[car_no].ch_rfrom(date);
       std:: cout<<"Enter the date you will be returning this car in ddmmyy format.\n";
        string re_date;
        std::cin>>re_date;
        CUSTOMER[id].Return_dates.push_back({car_no,re_date});
        int date1[3] = {(date[0]-'0')*10+(date[1]-'0'), (date[2]-'0')*10+(date[3]-'0') , (date[4]-'0')*10+(date[5]-'0')  };
        int date2[3] = {(re_date[0]-'0')*10+(re_date[1]-'0'), (re_date[2]-'0')*10+(re_date[3]-'0') , (re_date[4]-'0')*10+(re_date[5]-'0')  }; 
        cout<< "You have to pay " <<CARS[car_no].rent()*countNoOfDays(date1,date2)<<endl;
    }  
        else rent_car();
    
    }
     
};
class Employee{
 public:
    int id;
    void Rented_Cars( int id){

         std:: cout<<"You have rented "<<EMPLOYEE[id].cars_rented.size()<<" cars\n";

          if(EMPLOYEE[id].cars_rented.size()>0){
           std:: cout<<"The following are the names of the cars rented : \n";
            for(int index=0;index<EMPLOYEE[id].cars_rented.size();index++){
                int car_id = EMPLOYEE[id].cars_rented[index];
               std:: cout<<index+1<<")"<<" "<<CARS[car_id].c_name()<<endl;
            }

          }    
    }
 public : 
    void Fine_dues( int id){
        std:: cout<<"The following are your pending dues:\n";    
         if(EMPLOYEE[id].Return_dates.size()==0)std:: cout<<"There are NO pending dues.\n";
         else{
           float total_dues = 0;
           for(int ind = 0; ind < EMPLOYEE[id].Return_dates.size(); ind++){
               int cr_id = EMPLOYEE[id].Return_dates[ind].first;
               string r_dt = EMPLOYEE[id].Return_dates[ind].second;
               string i_dt = CARS[cr_id].r_from();
               int date1[3] = {(i_dt[0]-'0')*10+(i_dt[1]-'0'), (i_dt[2]-'0')*10+(i_dt[3]-'0') , (i_dt[4]-'0')*10+(i_dt[5]-'0')  };
               int date2[3] = {(r_dt[0]-'0')*10+(r_dt[1]-'0'), (r_dt[2]-'0')*10+(r_dt[3]-'0') , (r_dt[4]-'0')*10+(r_dt[5]-'0')  };
               int rented_days = countNoOfDays(date1, date2);
               float this_price = CARS[cr_id].rent() * rented_days;
              std:: cout<<"Car Name : "<<CARS[cr_id].c_name()<<" Rent to be paid : "<<this_price<<endl;
               total_dues+=this_price;
           }
          std:: cout<<"Total dues to be paid: "<<0.85*total_dues<<endl;
         }

 }

    void see_cars(){
        int flag = 0;
        for(int car_num = 0; car_num < CARS.size(); car_num++){
          if(CARS[car_num].av() == 1)  {
           std:: cout<<"CAR_NUMBER = "<<car_num<<" CAR_NAME = "<<CARS[car_num].c_name()<<" RENT_PRICE = "<<CARS[car_num].rent()<<endl;
            flag++;
            }
        }
        if(flag==0)std:: cout<<"Sorry, No cars are availaible for now.";
        else std:: cout<<"These cars are availaible for renting.\n";

    }
    void rent_car(){
      std:: cout<<"Provide the number of the car you want to rent.\n";
        int car_no;
        std::cin>>car_no;
       std:: cout<<"This car has per day rental price "<<CARS[car_no].rent()<<endl;
       cout<<"To confirm Press 1 otherwise select other car press other digit.\n";
       int c;
       cin>>c;
       if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return ;
      }
      if(c==1){
        CARS[car_no].setav();
        CUSTOMER[id].cars_rented.push_back(car_no);
       std:: cout<<"Enter today's date in ddmmyy format.\n";
        string date;
        std::cin>>date;
        CARS[car_no].ch_rfrom(date);
       std:: cout<<"Enter the date you will be returning this car in ddmmyy format.\n";
        string re_date;
        std::cin>>re_date;
        EMPLOYEE[id].Return_dates.push_back({car_no,re_date});
        int date1[3] = {(date[0]-'0')*10+(date[1]-'0'), (date[2]-'0')*10+(date[3]-'0') , (date[4]-'0')*10+(date[5]-'0')  };
        int date2[3] = {(re_date[0]-'0')*10+(re_date[1]-'0'), (re_date[2]-'0')*10+(re_date[3]-'0') , (re_date[4]-'0')*10+(re_date[5]-'0')  }; 
        cout<< "You have to pay " <<CARS[car_no].rent()*countNoOfDays(date1,date2)<<endl;
    }  
        else rent_car();
    }  

};
class Manager : public Customer, public Employee{
       public: 
       void add_customer(string name){
        int id = CUSTOMER.size();
        Customer_db tmp(id,name,{},0,100,{});
        CUSTOMER.push_back(tmp);
       std:: cout<<"Customer Added with Customer ID "<<id<<endl;

       }  

      void delete_customer( int id){
        CUSTOMER[id].del();

      } 

      void update_customer( int id, int car_id, string late_date){
        string i_dt = CARS[car_id].r_from();
        int date1[3] = {(i_dt[0]-'0')*10+(i_dt[1]-'0'), (i_dt[2]-'0')*10+(i_dt[3]-'0') , (i_dt[4]-'0')*10+(i_dt[5]-'0')  };
        int date2[3] = {(late_date[0]-'0')*10+(late_date[1]-'0'), (late_date[2]-'0')*10+(late_date[3]-'0') , (late_date[4]-'0')*10+(late_date[5]-'0')  };
        int late_days = countNoOfDays(date1, date2);
        int extra_fine = late_days*CARS[car_id].rent();
        CUSTOMER[id].c_f_dues(extra_fine);
        CUSTOMER[id].ch_record(late_days);
       std:: cout<< extra_fine <<"extra fine has been imposed due to late return.";

      }
      
      void list_customers(){
         for(int i=0;i<CUSTOMER.size();i++){
          if(CUSTOMER[i].c_record() >= 20){
           std:: cout<<"Customer Id "<<CUSTOMER[i].ID()<<" Customer Name "<<CUSTOMER[i].c_name()<<endl;
          }
        }
      }
      void add_employee(string name){
        int id = EMPLOYEE.size();
        Employee_db tmp(id,name,{},0,100,{});
        EMPLOYEE.push_back(tmp);
       std:: cout<<"Employee added with Employee ID "<<id<<endl;

      }  

      void delete_employee( int id){
        EMPLOYEE[id].del();

      } 
           
      void update_employee( int id, int car_id, string late_date){
        string i_dt = CARS[car_id].r_from();
        int date1[3] = {(i_dt[0]-'0')*10+(i_dt[1]-'0'), (i_dt[2]-'0')*10+(i_dt[3]-'0') , (i_dt[4]-'0')*10+(i_dt[5]-'0')  };
        int date2[3] = {(late_date[0]-'0')*10+(late_date[1]-'0'), (late_date[2]-'0')*10+(late_date[3]-'0') , (late_date[4]-'0')*10+(late_date[5]-'0')  };
        int late_days = countNoOfDays(date1, date2);
        float extra_fine = late_days*CARS[car_id].rent();
        EMPLOYEE[id].e_f_dues(0.85*extra_fine);
        EMPLOYEE[id].eh_record(late_days);
       std:: cout<< extra_fine <<"extra fine has been imposed due to late return.";

      }   
      
      void list_employees(){
        for(int i=0;i<EMPLOYEE.size();i++){
          if(EMPLOYEE[i].e_record() != 0){
           std:: cout<<"Employee Id "<<EMPLOYEE[i].ID()<<" Employee Name "<<EMPLOYEE[i].e_name()<<endl;
          }
        }
      }
      void add_car(string car_name, int rent_price, string todays_date){
        Car_db tmp_car(CARS.size(),1,car_name,rent_price,todays_date);
        CARS.push_back(tmp_car);
       std:: cout << car_name <<" has been added and assigned number is "<<CARS.size()-1<<endl; 
      }     
      
      void delete_car(int car_no){
        if(CARS[car_no].av()==1){
        CARS[car_no].delet();
       std:: cout<<"This car has been deleted from the record.\n";}
       else if(CARS[car_no].av() == 0){
        cout<<"This car is not availaible for deletion.\n";
       }

      }

      void update_car(int car_no, int new_rprice, string new_date){
        
        CARS[car_no].update(car_no,new_rprice,new_date);
        std:: cout<<"The details of this car have been updated.\n";
      }

       

};

int main(){
    // Declaring CARS DataBase.
    vector<string> CarNames = {"Toyota Camry", "Honda Accord", "Ford Fusion", "Chevrolet Malibu",
                                   "Nissan Altima", "Hyundai Sonata", "Kia Optima", "Mazda6",
                                   "Volkswagen Passat", "Subaru Legacy"};

    for (int i = 0; i < 10; ++i) {
        Car_db car_entry(i,1,CarNames[i],100+10*i,"030324");
        CARS.push_back(car_entry);
    }
    // Declaring CUSTOMER DataBase.
    for (int i = 0; i <= 9; ++i) {
        Customer_db customer_entry(i,"Customer"+to_string(i+1),{},0,100,{}); 
        CUSTOMER.push_back(customer_entry);
    }
    // Declaring Employee DataBase.
    for (int i = 0; i <= 9; ++i) {
        Employee_db employee_entry(i,"Employee"+to_string(i+1),{},0,100,{});
        EMPLOYEE.push_back(employee_entry);
    }                                                                                                                                            

    // Starting the System.
   
       std:: cout<<"WELCOME TO CAR RENTAL SYSTEM :)\n";
       int stay = 1;
       while(stay){
       std:: cout<<"Specify your role.\n"<<"Press 1 if you are CUSTOMER.\n"<<"Press 2 if you are MANAGER\n"<<"Press 3 if you are EMPLOYEE.\n";
       int role;
       std::cin>>role;
    
       if (std::cin.fail()) {
       std:: cout << "Failed reading number, Try again." << endl;
       return 1;
       }
      else if(role==1){
      std:: cout<<"Please enter your Customer ID.\n";
      int Customer_ID;
      std::cin>>Customer_ID;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
        } 
      if(Customer_ID>=CUSTOMER.size()){
        "You are not a validated CUSTOMER.\n";             
      }
      else{
      std:: cout<<"How can we help you?\n";
      std:: cout<<"Press 1 to see menu.\n";
      int menu;
      std::cin>>menu;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }

      while(menu){
      std:: cout<<"Press 1 if you want to see the availaible cars.\n"<<"Press 2 if you want to see your fine dues.\n"<<"Press 3 if you want to see cars you have rented out.\n"<<"Press 4 if you want to rent a car.\n";
      int enquiry;
      std::cin>>enquiry;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      else if(enquiry == 1){
      Customer c;
      c.id = Customer_ID;
      c.see_cars();
      int forward;
      std:: cout<<"Press 0 to exit, to continue enter any other digit \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;

      }  

      else if(enquiry == 2){
      Customer c;
      c.id = Customer_ID;
      c.Fine_dues(Customer_ID);
      int forward;
     std:: cout<<"Press 0 to exit, to continue enter any other digit \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;

      }

      else if(enquiry == 3){
      Customer c;
      c.id = Customer_ID;
      c.Rented_Cars(Customer_ID);
      int forward;
      std:: cout<<"Press 0 to exit, to continue enter any other digit \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;  
    
      }
      else if(enquiry == 4){
      Customer c;
      c.id = Customer_ID;
      c.rent_car();
      int forward;
      std:: cout<<"Press 0 to exit, to continue enter any other digit \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;  
      }
      else{
      std:: cout<<"Enter a valid input\n";
      int forward;
      std:: cout<<"Press 0 to exit, to continue enter any other digit \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward; 
       }

      }
    }
    
    }

    else if(role==2){
      int t = 1;
      while(t){
      int to_edit;
      std:: cout<<"Press 1 if you want to make changes to EMPLOYEE/CUSTOMER data.\n";
      std:: cout<<"Press 2 if you want to make changes to CAR data. \n";
      std::cin>>to_edit;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      if(to_edit==1){
        int query;
        std:: cout<<"Press 1 if you want to make changes to CUSTOMER data.\n";
        std:: cout<<"Press 2 if you want to make changes to EMPLOYEE data. \n";
        std::cin>>query;
        if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
        if(query == 1){
          Manager m;
         std:: cout<<"Press 1 to add new customer.\n";
         std:: cout<<"Press 2 to delete an existing customer.\n";
         std:: cout<<"Press 3 to update a customer record.\n";
         std:: cout<<"Press 4 to see list of all updated customers.\n";
          int fun;
          std::cin>>fun;
          if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          if(fun == 1){
           std:: cout<<"Enter the name of the customer.\n";
            string name;
            std::cin>>name;
            m.add_customer(name);
           std:: cout<<"Press 0 to exit else Press any digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
                std:: cout << "Failed reading number, Try again." << endl;
                return 1;
                      }
               }
            else if(fun == 2){
            std:: cout<<"Enter the ID of the customer you want to delete.\n";
            int del_id;
            std::cin>>del_id;
            m.delete_customer(del_id);
            std:: cout<<"Customer acocunt deleted.\n";
            std:: cout<<"Press 0 to exit else Press any digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
                std:: cout << "Failed reading number, Try again." << endl;
                return 1;
                              }
          }
          else if(fun == 3){
           std:: cout<<"Enter the ID of the customer you want to update records.\n";
            int cus_id;
            std::cin>>cus_id;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
           std:: cout<<"Enter the number of cars returned late.\n ";
            int n_cars_late;
            std::cin>>n_cars_late;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
            while(n_cars_late--){
              int cr_id;
              string cr_name;
             std:: cout<<"Enter the Car id.\n";
              std::cin>>cr_id;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
             std:: cout<<"Enter the date of return in ddmmyy format.\n";
              std::cin>>cr_name;
              if (std::cin.fail()) {
      std:: cout << "Failed reading name, Try again." << endl;
      return 1;
      }
              m.update_customer(cus_id,cr_id,cr_name);
             std:: cout<<"Record for this car has been updated. Proceed Further.\n";
            }
           std:: cout<<"Press 0 to exit else Press any other digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          }
          else if(fun==4){
            m.list_customers();
           std:: cout<<"Press 0 to exit else Press any other digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          }

        }
          else if(query == 2){
          Manager m;
         std:: cout<<"Press 1 to add new employee.\n";
         std:: cout<<"Press 2 to delete an existing employee.\n";
         std:: cout<<"Press 3 to update a employee record.\n";
         std:: cout<<"Press 4 to see the updated employee list.\n";
          int fun;
          std::cin>>fun;
          if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          if(fun == 1){
           std:: cout<<"Enter the name of the employee.\n";
            string name;
            std::cin>>name;
            m.add_employee(name);
           std:: cout<<"Press 0 to exit else Press any digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          }
          else if(fun == 2){
           std:: cout<<"Enter the ID of the employee you want to delete.\n";
            int del_id;
            std::cin>>del_id;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
            m.delete_employee(del_id);
           std:: cout<<"Employee account deleted.\n";
           std:: cout<<"Press 0 to exit else Press any digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          }
          else if(fun == 3){
           std:: cout<<"Enter the ID of the EMPLOYEE you want to update records.\n";
            int emp_id;
            std::cin>>emp_id;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
           std:: cout<<"Enter the number of cars returned late.\n ";
            int n_cars_late;
            std::cin>>n_cars_late;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
            while(n_cars_late--){
              int cr_id;
              string cr_name;
             std:: cout<<"Enter the Car id.\n";
              std::cin>>cr_id;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
             std:: cout<<"Enter the date of return in ddmmyy format.\n";
              std::cin>>cr_name;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
              m.update_employee(emp_id,cr_id,cr_name);
             std:: cout<<"Record for this car has been updated. Proceed Further.\n";
            }
           std:: cout<<"Press 0 to exit else Press any other digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          }
          else if(fun == 4){
            m.list_employees();
           std:: cout<<"Press 0 to exit else Press any other digit.\n";
            std::cin>>t;
            if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
          }       

          }

      }
          else if(to_edit == 2){
           std:: cout<<"Press 1 if you want to add a car to CARS database.\n";
           std:: cout<<"Press 2 if you want to delete a car from CARS database.\n";
           std:: cout<<"Press 3 if you want to update a car information.\n";
            int operation;
            std::cin>>operation;
            if(operation == 1){
              string car_name;
             std:: cout<<"Enter the name of the car you want the add.\n";
              std::cin>>car_name;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
              string date;
             std:: cout<<"Enter date from which it will be availaible to rent out in ddmmyy format.\n";
              std::cin>>date;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
              int rent_price;
             std:: cout<<"Enter the rental price per day of the car.\n";
              std::cin>>rent_price;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
              Manager m;
              m.add_car(car_name,rent_price,date);
             std:: cout<<"Press 0 to exit else Press any other digit.\n";
              std::cin>>t;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
            }

            else if(operation == 2){
              int car_number;
             std:: cout<<"Enter the number of the car you want to delete.\n";
              Manager m;
              m.delete_car(car_number);
             std:: cout<<"Press 0 to exit else Press any other digit.\n";
              std::cin>>t;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }

            }

            else if(operation == 3){
              int car_number;
              int new_rent_price;
              string new_availaibility_date;
             std:: cout<<"Enter the number of the car you want to update.\n";
              std::cin>>car_number;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
             std:: cout<<"Enter the new rental price of the car.\n";
              std::cin>>new_rent_price;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
             std:: cout<<"Enter the updated date of availaibility of the car.\n";
              std::cin>>new_availaibility_date;
              if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
              Manager m;
              m.update_car(car_number,new_rent_price,new_availaibility_date);

            }

          }

      } 

    }

    else if(role==3){
   std:: cout<<"Please enter your Employee ID.\n";
    int Employee_ID;
    std::cin>>Employee_ID;
    if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      if(Employee_ID>=EMPLOYEE.size()){
        "You are not a validated EMPLOYEE.\n";             
      }
      else{
     std:: cout<<"How can we help you?\n";
     std:: cout<<"Press 1 to see menu.\n";
      int menu;
      std::cin>>menu;
    if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      while(menu){
     std:: cout<<"Press 1 if you want to see the availaible cars.\n"<<"Press 2 if you want to see your fine dues.\n"<<"Press 3 if you want to see cars you have rented out.\n"<<"Press 4 if you want to rent a car.\n";
      int enquiry;
      std::cin>>enquiry;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      if(enquiry == 1){
      Employee c;
      c.id = Employee_ID;
      c.see_cars();
      int forward;
     std:: cout<<"Press 0 to exit, to continue Press any digit.\n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;

      }  

      else if(enquiry == 2){
      Employee c;
      c.id = Employee_ID;
      c.Fine_dues(Employee_ID);
      int forward;
     std:: cout<<"Press 0 to exit, to continue Press any digit. \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;

      }

      else if(enquiry == 3){
      Employee c;
      c.id = Employee_ID;
      c.Rented_Cars(Employee_ID);
      int forward;
      
     std:: cout<<"Press 0 to exit, to continue Press any digit.\n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;  
    
      }
      else if(enquiry == 4){
      Employee c;
      c.id = Employee_ID;
      c.rent_car();
      int forward;
     std:: cout<<"Press 0 to exit, to continue Pressany digit. \n";
      std::cin>>forward;
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
      menu = forward;  
      }
      else{
     std:: cout<<"Enter a valid input\n";
      int forward;
     std:: cout<<"Press 0 to exit, to continue Press any digit. \n";
      std::cin>>forward;            
      if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }                                                            
      menu = forward; 
       }

      }
    }      

    }

    else{
     std:: cout<<"Enter a valid input.\n";
      continue;
    }
   std:: cout<<"If you want to exit PRESS 0, to re-enter to the system press any digit.\n";
    std::cin>>stay;
    if (std::cin.fail()) {
      std:: cout << "Failed reading number, Try again." << endl;
      return 1;
      }
    }
    return 0;
}