OOP With C++ (Part 1)

#include
#include
#include
class Akar {
    friend ostream& operator<<(ostream&, Akar&);
    friend istream& operator>>(istream&, Akar&);
public:
    Akar();
    int disk() { return B*B-4*A*C; }
    float akar1() {return -B+sqrt(disk())/(2*A); }
    float akar2() {return -B-sqrt(disk())/(2*A); }
    void hitung_akar();
    void cetak_disk() { cout << "diskriminan = " << disk() << endl; }
    void cetak_akar() {
        cout << "x1 = " << akar1() << endl;
        cout << "x2 = " << akar2() << endl;
    }
    void cetak_imaginer(){
         cout << -B/(2*A)<<" + "<< sqrt(abs(disk()))/(2*A)<<" I ";

    }
private:
    float A, B, C,x1, x2;
};
ostream& operator<<(ostream& out, Akar& keluaran) {
    keluaran.cetak_disk();
    if (keluaran.disk() >= 0) keluaran.cetak_akar();
    else keluaran.cetak_imaginer();
    return out;
}

istream& operator>>(istream& in, Akar& masukan) {
    cout << "Koefisien pangkat 2   : "; in >> masukan.A;
    cout << "Koefisien pangkat 1   : "; in >> masukan.B;
    cout << "Koefisien pangkat 0   : "; in >> masukan.C;
    return in;
}

Akar::Akar() {
    cout << "Menghitung akar persamaan kuadrat\n";
}

void Akar::hitung_akar() {
     if (A == 0) {
        cout << "bukan pers. kuadrat.\n";
        cout << "Harga akar = " << -C/B; }  else {
          if (disk() > 0) {
             x1 = akar1();
             x2 = akar2();
          }  else if (disk() == 0) {
                    x1 = akar1();
                    x2 = x1;
             }
     }
}

main() {
    Akar kasus;
    cin >> kasus;
    kasus.hitung_akar();
    cout << kasus;
    getch();
    return 0;
}

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