errorr

void pilih_buku(string judul[],int panjang_j){
    int i=0;

            while(judul[i]!="" && i<panjang_j){
                cout<<"ke "<<i+1<<"\t";
                cout<<judul[i];
                cout<<endl;
            i++;
            }
}

int main()
{
     string judul[] = {"asd","asd1","asd2","asd3","asd4"};

   string isi[] = {"Lorem1 ipsum dolor sit amet.",
                    "Lorem2 ipsum dolor sit amet.",
                    "Lorem3 ipsum dolor sit amet.",
                     "Lorem4 ipsum dolor sit amet.",
                     "Lorem5 ipsum dolor sit amet."};

      string username[]={"user","user1"};

      string password[]={"user","user1"};
       int panjang_j = sizeof(judul)/sizeof(judul[0]);
    int panjang = sizeof(username)/sizeof(username[0]);

string user,pass,kondisi,pinjam,id,pw,data,j,isii,peminjam;
    int pilih,buku,buku1,hari,hapus,hasil;
    do{

        cout<<"-*-*-*\tSelamat datang\t-*-*-* "<<endl;
        cout<<"|\tDi Perpustakaan\t\t|"<<endl;

        cout<<"|\tPilih aksi mu : \t|" <<endl;
        cout<<"|\t1.Baca Buku\t\t|" <<endl;
        cout<<"|\t2.Pinjam Buku\t\t|" <<endl;
        cout<<"|\t3.cetak faktur\t\t|" <<endl;
        cout<<"|\t4.Daftar anggota\t\t|" <<endl;
        cout<<"|\t5.tambah buku\t\t|" <<endl;
        cout<<"|\t6.Keluar\t\t|" <<endl;
        cin>>pilih;
        switch(pilih){

            case 1:{
                system("cls");

                pilih_buku(judul,panjang_j);
                cout<<"\tpilih buku : "<<endl;
                cin>>buku;
                system("cls");
                baca(isi,buku,panjang_j);
                system("pause");
                system("cls");
                break;
            }
            case 2:{
             /*  system("cls");
                cout<<"\tPinjam Buku"<<endl;
                cout<<"masukan username dan password dari kartu anda "<<endl;
                cout<<"Username :";
                cin>>user;
                cout<<"password :";
                cin>>pass;
                kondisi = cek(username,password,user,pass,panjang);
                if(kondisi=="berhasil"){
                        peminjam=user;
                    cout<<"\t berhasil "<<endl;
                     pilih_buku(judul,panjang_j);
                    cout<<"silahkan pilih buku " <<endl;
                    cin>>buku1;
                    pilih_pinjam(judul,buku1,panjang_j);
                    cout<<"berapa hari peminjaman : "<<endl;
                    cin>>hari;
                    cout<<"terima kasih transaksi berhasil ";

                }else{
                    cout<<"gagal";
                }
                system("pause");
                system("cls");*/
                break;
            }