/* 1 for login, 2 for register. [login] username, password. [register] username, password, agreement ( 1 ). */ #include #include using namespace std; #define FILENAME "data.bin" void what_action(); void register_menu(); void login_menu(); void add_user(string username, string password); bool check_user(string username, string password); int main() { what_action(); } void what_action() { short int input; cout << "1. Login\n2. Register" << endl; cin >> input; switch(input) { case 1: login_menu(); break; case 2: register_menu(); break; default: cout << "Type Again!" << endl;; what_action(); break; } } void register_menu() { string user, pw; int agree; cout << "Username: "; cin >> user; cout << "Password: "; cin >> pw; cout << "Have You Read our Agreement ? ( 1 = yes )"; cin >> agree; switch(agree) { case 1: add_user(user, pw); break; default: cout << "Please Read our Agreement First !" << endl; register_menu(); break; } } void login_menu() { string user, pw; cout << "Username: "; cin >> user; cout << "Password: "; cin >> pw; if(check_user(user, pw) == true) cout << "you have logged in succefully !" << endl; else cout << "Data is Wrong!" << endl; } void add_user(string username, string password) { ofstream file; file.open(FILENAME, ios_base::app); file << username << "\n"; file << password << "\n"; file.close(); } bool check_user(string username, string password) { ifstream file; string line; bool what_to_return; file.open(FILENAME, ios_base::binary); if(file.is_open()) { while(getline(file, line)) { string usr, pw; usr = line; getline(file,line); pw = line; if(usr == username && password == pw) { what_to_return = true; break; } else what_to_return = false; } } return what_to_return; }

Simple Register and Login Example