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I'm currently self-teaching myself C++, using a C++ For Dummies book that I bought a couple months ago. To practice, I've created a Bank class that holds usernames and passwords, and that has a login/logout system. IT also implements a failsafe if there are too many failed login attempts. I'm looking for advice that can help make this code better, i.e more efficient, more compact, and more up-to-date with todays C++ standards. Any and all help is appreciated and considered.

bank.cpp

//Include Statements
#include <iostream>
#include <vector>
#include <string>

//Class Body
class Bank 

 std::vector<std::string> usernames;
 std::vector<std::string> passwords;
 std::string user;
 int attempts;
 bool lockedOut;

 public:
 bool login(std::string username, std::string password);
 void logout();
 std::string getCurrentUser();
 //Constructor
 Bank() 
 generateTestAccounts();
 attempts = 0;
 lockedOut = false;
 

 private:
 void generateTestAccounts();

;

//Class Functions

/*
* Checks if a user is not logged in, and if not, checks to see if
* the passed username and password match any in the Bank
*/
bool Bank::login(std::string username, std::string password) 
 if(!lockedOut) 
 if(user.empty()) 
 for(int i = 0; i < usernames.size(); i++) 
 if(usernames[i].compare(username) == 0) 
 user = username;
 return true;
 
 
 
 attempts += 1;
 if(attempts == 3) 
 lockedOut = true;
 
 
 return false; 



/*
* Logs out the current user by clearing the string value from `user`
*/
void Bank::logout() 
 user.clear(); //basically null


/*
* Returns the currently logged in user
*/
std::string Bank::getCurrentUser() 
 return user;
;

/*
* Generates test accounts that can be used to make sure the
* `login` method works
*/
void Bank::generateTestAccounts() 
 for(int i = 0; i < 5; i++) 
 usernames.push_back("user" + std::to_string(i));
 passwords.push_back("pass" + std::to_string(i));
 


/*
* main method for testing bank class
*/
int main() 
 Bank bank;
 std::string us = "user1";
 std::string pw = "pass1";
 if(bank.login(us, pw)) 
 std::cout << "Logged in as " + us << std::endl;