cnd

#include <iostream>
using namespace std;

int main(){
    char pilihan, q;
    string username, password;

    cout << "=== Welcome ===" << endl;
    cout << "Username: ";
    cin >> username;
    cout << "Password: ";
    cin >> password;

    if (username == "admin"){
        if (password == "final"){
            cout << "Selamat datang!" << endl;
        } else {
            cout << "Password salah, coba lagi!" << endl;
        }
    } else {
        cout << "Anda tidak terdaftar" << endl;
    }

menu:
    cout << "1. ip" << endl;
    cout << "2. test" << endl;
    cin >> pilihan;

switch(pilihan){
case '1':
            int a[4],i=0;

        cout<<"Masukkan IP address: ";
        for(i=0;i<4;i++)
                cin>>a[i];

        cout<<"\n IP Address:"<<a[0];
        cout<<"."<<a[1]<<"."<<a[2]<<"."<<a[3]<<"\n";

        cout<<"Ini Termasuk IP Address: ";

        if(a[0]>=0 && a[0]<=127)
        cout << "Class A" << endl;
        if(a[0]>127 && a[0]<191)
        cout << "Class B" << endl;
        if(a[0]>191 && a[0]<224)
        cout << "Class C";
        if(a[0]>224 && a[0]<=239)
        cout  <<"Class D" << endl;
        if(a[0]>239)
        cout << "Class E" << endl;

    std::cout << "Apakah anda Ingin lagi? [Y/N]";
    std::cin >> q;

    if(q == 'Y' || q == 'y')
    {
        goto menu;
    }else if ( q == 'N' || q == 'n'){
        goto finish;
    }else {
        goto finish;
    }
     cin.get();
     break;

case '2':
            cout << "test" << endl;

    std::cout << "Apakah anda Ingin lagi? [Y/N]";
    std::cin >> q;

    if(q == 'Y' || q == 'y')
    {
        goto menu;
    }else if ( q == 'N' || q == 'n'){
        goto finish;
    }
     cin.get();
     break;

}

return 0;
}