#include <iostream>
#include <cstdlib>
using namespace std;

int main(){
    string nim, pass;
    int sks=0, pil, yn, total, bayar, kembali;

    login:
    cout<< "NIM      : ";
    cin>>nim;
    cout<< "Password : ";
    cin>>pass;
    if (nim != "235150301111048" | pass != "123456") {
        system&#40;"cls"&#41;;
        cout<<"NIM atau Password tidak sesuai . . .\n"<<endl;
        goto login;
    }
    system&#40;"cls"&#41;;
    cout<<"SELAMAT ANDA BERHASIL LOGIN!\n"<< "SELAMAT DATANG PADA SISTEM PENDAFTARAN SEMESTER ANTARA\n"<< endl;
    menu:
    cout<<"Pilihan mata kuliah :\n"<<"1. Sistem Digital (Ketentuan: 4 sks)\n"<< "2. Sistem Linear (Ketentuan: 3 sks)\n";
    cout<<"3. Pemrograman Lanjut (Ketentuan: 4 sks)\n"<< "4. Matematika Komputasi (Ketentuan: 3 sks)\n"<< endl;
    cout<<"5. Bayar\n"<<"6. Batal\n";
    cout<<"MAsukan pilihan anda : ";
    cin>>pil;
    cout<<endl;
    switch (pil){
        case 1:
        system&#40;"cls"&#41;;
            sisdig:
            cout<<"Mata Kuliah  : Sistem Digital\n"<<"Jumlah sks   : 4 sks\n";
            cout<<"Harga        : Rp 400.000,-\n"<<"Apakah anda ingin menambahkan mata kuliah ini?\n";
            cout<<"1. Ya\n"<<"2. Tidak\n"<<"Pilihan anda : ";
            cin>>yn;
            switch (yn){
                case 1:
                sks += 4;
                system&#40;"cls"&#41;;
                goto menu;
                break;
                case 2:
                system&#40;"cls"&#41;;
                goto menu;
                break;
                default:
                system&#40;"cls"&#41;;
                cout<<"Pilihan yang anda masukkan tidak tersedia . . .\n"<<endl;
                goto sisdig;
                break;
            }
            break;
        case 2:
        system&#40;"cls"&#41;;
            silir:
            cout<<"Mata Kuliah  : Sistem Linier\n"<<"Jumlah sks   : 3 sks\n";
            cout<<"Harga        : Rp 300.000,-\n"<<"Apakah anda ingin menambahkan mata kuliah ini?\n";
            cout<<"1. Ya\n"<<"2. Tidak\n"<<"Pilihan anda : ";
            cin>>yn;
            switch (yn){
                case 1:
                sks += 3;
                system&#40;"cls"&#41;;
                goto menu;
                break;
                case 2:
                system&#40;"cls"&#41;;
                goto menu;
                break;
                default:
                system&#40;"cls"&#41;;
                cout<<"Pilihan yang anda masukkan tidak tersedia . . .\n"<<endl;
                goto silir;
                break;
            }
            break;
        case 3:
        system&#40;"cls"&#41;;
            pemla:
            cout<<"Mata Kuliah  : Pemrograman Lanjut\n"<<"Jumlah sks   : 4 sks\n";
            cout<<"Harga        : Rp 400.000,-\n"<<"Apakah anda ingin menambahkan mata kuliah ini?\n";
            cout<<"1. Ya\n"<<"2. Tidak\n"<<"Pilihan anda : ";
            cin>>yn;
            switch (yn){
                case 1:
                sks += 4;
                system&#40;"cls"&#41;;
                goto menu;
                break;
                case 2:
                system&#40;"cls"&#41;;
                goto menu;
                break;
                default:
                system&#40;"cls"&#41;;
                cout<<"Pilihan yang anda masukkan tidak tersedia . . .\n"<<endl;
                goto pemla;
                break;
            }
            break;
        case 4:
        system&#40;"cls"&#41;;
            matkom:
            cout<<"Mata Kuliah  : Matematika Komputasi\n"<<"Jumlah sks   : 3 sks\n";
            cout<<"Harga        : Rp 300.000,-\n"<<"Apakah anda ingin menambahkan mata kuliah ini?\n";
            cout<<"1. Ya\n"<<"2. Tidak\n"<<"Pilihan anda : ";
            cin>>yn;
            switch (yn){
                case 1:
                sks += 3;
                system&#40;"cls"&#41;;
                goto menu;
                break;
                case 2:
                system&#40;"cls"&#41;;
                goto menu;
                break;
                default:
                system&#40;"cls"&#41;;
                cout<<"Pilihan yang anda masukkan tidak tersedia . . .\n"<<endl;
                goto matkom;
                break;
            }
            break;
        case 5:
        if (sks==0){
            system&#40;"cls"&#41;;
            cout<<"Keranjang anda masih kosong . . .\n";
            goto menu;
        } else if (sks<=9){
            system&#40;"cls"&#41;;
            cout<<"PEMBAYARAN\n";
            total = sks * 100000;
            cout<<"\nTotal Bayar  : Rp "<<total;
            cout<<"\nUang Bayar   : Rp ";
            cin>>bayar;
            kembali=bayar-total;
            if (total<=bayar){
            cout<<"uang kembali : Rp "<<kembali;
            } else {
                cout<<"Uang anda tidak cukup!";
            }
        } else {
            system&#40;"cls"&#41;;
            cout<<"PEMBAYARAN\n";
            total = sks * 100000;
            cout<<"\nTotal Bayar  : Rp "<<total;
            cout<<"\nMaaf jumlah maksimal sks yang bisa anda ambil adalah sebanyak 9 sks";
        }
        break;
        case 6:
        cout<<"===================="<<"    TERIMA KASIH    ";
        cout<<"====================";
        break;
        default:
        system&#40;"cls"&#41;;
        cout<<"Pilihan yang anda masukkan tidak tersedia . . .\n"<<endl;
        goto menu;
        break;
    }
    return 0;
}