Giải Đề OOP 2

//https://www.facebook.com/pages/C%C3%B9ng-h%E1%BB%8Dc-l%E1%BA%ADp-tr%C3%ACnh/632038696941833

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

class Ve
{

protected:
    string MaVe, HoTen;
    int NamSinh, SoTroChoi;
public:
    Ve(string MaVe = "", string HoTen = "", int NamSinh = 0, int SoTroChoi = 0)
    {
        this->HoTen = HoTen;
        this->MaVe = MaVe;
        this->NamSinh = NamSinh;
        this->SoTroChoi = SoTroChoi;
    }
    virtual void Nhap()
    {
        fflush(stdin);
        cout << "Nhap ma ve: ";
        getline(cin, this->MaVe);
        cout << "Nhap ten: ";
        getline(cin, this->HoTen);
        cout << "Nhap nam sinh: ";
        cin >> this->NamSinh;
    }
    virtual int TienVe() = 0;
    virtual int LayLoaiVe() = 0;
    virtual ~Ve(){}
};

class VeTronGoi : public Ve
{
public:
    VeTronGoi(string MaVe = "", string HoTen = "", int NamSinh = 0) : Ve(MaVe, HoTen, NamSinh, 0)
    {
    }
    ~VeTronGoi(){}

    void Nhap()
    {
        Ve::Nhap();
    }
    int TienVe()
    {
        return 200000;
    }
    int LayLoaiVe()
    {
        return 0;
    }
};

class VeTungPhan : public Ve
{
public:
    VeTungPhan(string MaVe = "", string HoTen = "", int NamSinh = 0, int SoTroChoi = 0) : Ve(MaVe, HoTen, NamSinh, SoTroChoi)
    {
    }
    ~VeTungPhan(){}

    void Nhap()
    {
        Ve::Nhap();
        cout << "Nhap so tro choi: ";
        cin >> this->SoTroChoi;
    }

    int TienVe()
    {
        return (70000 + 20000 * this->SoTroChoi);
    }
    int LayLoaiVe()
    {
        return 1;
    }
};

class DSVe
{
    Ve **dsVe;
    int SoVe;
    int TongTien;
public:
    DSVe()
    {
        do
        {
            cout << "So ve can nhap: ";
            cin >> this->SoVe;
        } while (this->SoVe < 0);

        TongTien = 0;
        dsVe = new Ve*[this->SoVe];
    }
    ~DSVe()
    {
        delete[] dsVe;
    }
    int NhapLoaiVe()
    {
        int a;
        do
        {
            cout << "1. Ve tron goi\n2. Ve tung phan\n\tNhap so tuong ung: ";
            cin >> a;
            if (a == 1 || a == 2) return (a - 1);
        } while (1);
    }
    void Nhap()
    {
        for (int i = 0; i < SoVe; i++)
        {
            cout << "Ve thu " << i + 1 << ": \n";
            switch (NhapLoaiVe())
            {
            case 0:
                dsVe[i] = new VeTronGoi;
                break;
            case 1:
                dsVe[i] = new VeTungPhan;
                break;
            }
            dsVe[i]->Nhap();
        }
    }
    int TinhTongTien()
    {
        for (int i = 0; i < this->SoVe; i++)
            TongTien += dsVe[i]->TienVe();
        return this->TongTien;
    }
    int LayTongTien()
    {
        return this->TongTien;
    }
    int SoVeTungPhan()
    {
        int s = 0;
        for (int i = 0; i < this->SoVe; i++)
        {
            if (dsVe[i]->LayLoaiVe() == 1)
                s++;
        }
        return s;
    }
};

void main()
{
    DSVe DS;
    DS.Nhap();
    cout << DS.TinhTongTien() << endl;
    cout << DS.SoVeTungPhan();
}