Đa Hình

#include <iostream>
#include <string>
using namespace std;
class NhanVien
{
protected:
	string Ten, NgaySinh;
	int Luong, LuongCoBan;
	virtual void Input(istream &in) = 0;
	virtual void Output(ostream &out) const = 0;
public:
	virtual void TinhLuong() = 0;
	int LayLuong(){ return this->Luong; }
	friend istream& operator >> (istream &in, NhanVien &NV)
	{
		fflush(stdin);
		cout << "Nhap Ten: ";
		getline(in, NV.Ten);
		cout << "Nhap Ngay Sinh: ";
		getline(in, NV.NgaySinh);
		cout << "Nhap Luong Can Ban: ";
		in >> NV.LuongCoBan;
		fflush(stdin);
		NV.Input(in);
		return in;
	}
	friend ostream& operator << (ostream& out, const NhanVien &NV)
	{
		out << "Ten: " << NV.Ten << endl;
		out << "Ngay Sinh: " << NV.NgaySinh << endl;
		out << "Luong Can Ban: " << NV.LuongCoBan << endl;
		NV.Output(out);
		out << "Luong: " << NV.Luong << endl;
		return out;
	}
};

class NhanVienVanPhong : public NhanVien
{
private:
	int SoNgayLamViec, TroCap;
protected:
	virtual void Input(istream &in)
	{
		cout << "So Ngay Lam Viec: ";
		in >> SoNgayLamViec;
		cout << "Tro Cap: ";
		in >> TroCap;
	}
	virtual void Output(ostream &out) const
	{
		out << "So Ngay Lam Viec: " << SoNgayLamViec << endl;
		out << "Tro Cap: " << TroCap << endl;
	}
public:
	void TinhLuong()
	{
		Luong = LuongCoBan + SoNgayLamViec * 200000 + TroCap;
	}
};

class NhanVienQuanLy : public NhanVien
{
private:
	int HeSoChucVu, Thuong;
protected:
	void Input(istream &in)
	{
		cout << "He So Chuc Vu: ";
		in >> HeSoChucVu;
		cout << "Thuong: ";
		in >> Thuong;
	}
	void Output(ostream &out) const
	{
		out << "He So Chuc Vu: " << HeSoChucVu << endl;
		out << "Thuong: " << Thuong << endl;
	}
public:
	void TinhLuong()
	{
		Luong = LuongCoBan * HeSoChucVu + Thuong;
	}
};

class NhanVienSanXuat : public NhanVien
{
private:
	int SoSanPham;
protected:
	void Input(istream &in)
	{
		cout << "So San Pham: ";
		in >> SoSanPham;
	}
	void Output(ostream &out) const
	{
		cout << "So San Pham: " <<  SoSanPham << endl;
	}
public:
	void TinhLuong()
	{
		Luong = LuongCoBan + SoSanPham * 2000;
	}
};

class DanhSachNhanVien
{
private:
	NhanVien **NV;
	int SoNhanVien;
	int TongLuong;
public:
	DanhSachNhanVien()
	{
		TongLuong = 0;
		SoNhanVien = 0;
		NV = NULL;
	}
	friend istream& operator >> (istream& in, DanhSachNhanVien &DS)
	{
		int LoaiNhanVien;
		cout << "Nhap So Nhan Vien: ";
		in >> DS.SoNhanVien;
		DS.NV = new NhanVien*[DS.SoNhanVien];
		for (int i = 0; i < DS.SoNhanVien; i++)
		{
			do
			{
				system("cls");
				cout << "1. Nhan Vien Van Phong\n2. Nhan Vien Quan Ly\n3. Nhan Vien San Xuat\n";
				cout << "Nhap so tuong ung: ";
				in >> LoaiNhanVien;
			} while (LoaiNhanVien < 1 || LoaiNhanVien > 3);
			switch (LoaiNhanVien)
			{
			case 1:
				DS.NV[i] = new NhanVienVanPhong;
				break;
			case 2:
				DS.NV[i] = new NhanVienQuanLy;
				break;
			case 3:
				DS.NV[i] = new NhanVienSanXuat;
				break;
			}
			in >> *DS.NV[i];
		}
		return in;
	}
	friend ostream& operator << (ostream& out, DanhSachNhanVien DS)
	{
		system("cls");
		for (int i = 0; i < DS.SoNhanVien; i++)
		{
			out << *DS.NV[i] << endl;
		}
		return out;
	}
	void TinhTongLuong()
	{
		for (int i = 0; i < SoNhanVien; i++)
		{
			NV[i]->TinhLuong();
			TongLuong += NV[i]->LayLuong();
		}
	}
	int GetTongLuong(){ return TongLuong; };
	~DanhSachNhanVien()
	{
		//chưa có contructor sao chép nên việc truyền tham trị sẽ sinh ra lỗi nên mình không để destructor hoạt động
/*		for (int i = 0; i < SoNhanVien; i++)
			delete NV[i];*/
	}
};
void main()
{
	DanhSachNhanVien DS;
	cin >> DS;

	DS.TinhTongLuong();
	cout << DS.GetTongLuong();
	cout << DS;
}