From our previous case study in the picture can u add $3$ other classes which are 'placing order', 'pick product' and 'payment' from the given image. Also same technique applies which is must include inheritance and polymorphism in it which is overloading and overriding.

In the 'order' class, please User are able to confirm their order and it will show the number and arrangement of orders shown.

In the 'payment' class, User are have options to pay via cash or credit card, if credit card, then it will send email for authentication.

And for 'product' class it will display the product menu, and also enable User to pick product.

Minimum attibutes for a class is $3,$ and minimum method for a class is also $3$

Here is the source code to modify:

#include

#include

#include

class User $\{$

protected:

std::string username;

std::string password;

public:

User$($std::string username, std::string password$)$ : username$($username$),$ password$($password$)\{\}$

virtual bool login$($std::string username, std::string password$)\{$

$//$ Check if the provided credentials match

return $($this$->$username $==$ username && this$->$password $==$ password$)$;

$\}$

void logout$()\{$

$//$ Logic for logout

$\}$

virtual void displayInfo$()\{$

std::cout $$ "User: $"$ username $$ std::endl;

$\}$

$\}$;

class Admin : public User $\{$

private:

int adminLevel;

public:

Admin$($std::string username, std::string password, int adminLevel$)$ : User$($username$,$ password$),$ adminLevel$($adminLevel$)\{\}$

void addNewUser$($std::string username, std::string password$)\{$

$//$ Add a new user logic

$\}$

void removeUser$($std::string username$)\{$

$//$ Remove a user logic

$\}$

bool login$($std::string username, std::string password$)$ override $\{$

$//$ Admin login logic

return User::login$($username$,$ password$)$;

$\}$

void displayInfo$()$ override $\{$

User::displayInfo$()$;

std::cout $$ "Admin Level: $"$ adminLevel $$ std::endl;

$\}$

$\}$;

class RegularUser : public User $\{$

private:

std::string email;

bool loggedIn;

public:

RegularUser$($std::string username, std::string password, std::string email$)$ : User$($username$,$ password$),$ email$($email$),$ loggedIn$($false$)\{\}$

void sendEmail$($std::string to$,$ std::string message$)\{$

$//$ Send email logic

$\}$

bool login$($std::string username, std::string password$)$ override $\{$

$//$ Regular user login logic

return User::login$($username$,$ password$)$;

$\}$

void displayInfo$()$ override $\{$

User::displayInfo$()$;

std::cout $$ "Email: $"$ email $$ std::endl;

$\}$

$\}$;

int main$()\{$

$//$ Testing the implemented classes

Admin admin$("$admin$",$ "adminpass", $5)$;

RegularUser user$("$user$",$ "userpass", "user@example.com"$)$;

$//$ Perform operations and tests here

if $($admin$.$login$("$admin$",$ "adminpass"$))\{$

admin.displayInfo$()$;

$\}$

if $($user$.$login$("$user$",$ "userpass"$))\{$

user.displayInfo$()$;

$\}$

return $0$;

$\}$