#include <iostream>
#include <string>

char username[30];
char password[30];
char userinputname[30];
char userinputpass[30];

using namespace std;

void registeruser () {

    cout << "Desired username (only up to 30 characters): ";
    cin >> username;
    cout << "\n\n";

    cout << "Desired password (only up to 30 characters): ";
    cin >> password;

}

void login () {

    cout << "Username: ";
    cin >> userinputname;
    cout << "\n\n";

    cout << "Password: ";
    cin >> userinputpass;
    cout << "\n\n";

    if (userinputname == username && userinputpass == password)  {

        cout << "Login success!";

    }

    else {

        cout << "Login failure.";

    }

}

int main () {

    string answer;

    cout << "Hello, and welcome to login v1.0\n\n";

    cout << "Do you have an account yet: ";
    cin >> answer;

    if (answer ==  "yes") {

        login();

    }

    else if (answer == "no") {

        registeruser();
        cout << "\n\n";
        login();

    }

    cin.get();
    return 0;
}