Untitled

#include <bits/stdc++.h>
using namespace std;

class HinhHoc
{
private:
    int a, b;

public:
    HinhHoc()
    {
        a = 0;
        b = 0;
    };

    HinhHoc(int a, int b)
    {
        this->a = a;
        this->b = b;
    }

    // Qua tai ++,--,*,/,+,-
    HinhHoc operator++()
    {
        ++a;
        ++b;
        return *this;
    }

    HinhHoc operator++(int)
    {
        HinhHoc temp = *this;
        ++a;
        ++b;
        return temp;
    }

    HinhHoc operator--()
    {
        --a;
        --b;
        return *this;
    }

    HinhHoc operator--(int)
    {
        HinhHoc temp = *this;
        --a;
        --b;
        return temp;
    }

    HinhHoc operator*(HinhHoc &obj)
    {
        HinhHoc temp;
        temp.a = a * obj.a;
        temp.b = b * obj.b;
        return temp;
    }

    HinhHoc operator/(HinhHoc &obj)
    {
        HinhHoc temp;
        temp.a = a / obj.a;
        temp.b = b / obj.b;
        return temp;
    }

    HinhHoc operator+(HinhHoc &obj)
    {
        HinhHoc temp;
        temp.a = a + obj.a;
        temp.b = b + obj.b;
        return temp;
    }

    HinhHoc operator-(HinhHoc &obj)
    {
        HinhHoc temp;
        temp.a = a - obj.a;
        temp.b = b - obj.b;
        return temp;
    }

    // Qua tai ==,!=,<,>,<=,>=
    bool operator==(HinhHoc &obj)
    {
        return (a == obj.a && b == obj.b);
    }

    bool operator!=(HinhHoc &obj)
    {
        return (a != obj.a || b != obj.b);
    }

    bool operator<(HinhHoc &obj)
    {
        return (a < obj.a && b < obj.b);
    }

    bool operator>(HinhHoc &obj)
    {
        return (a > obj.a && b > obj.b);
    }

    bool operator<=(HinhHoc &obj)
    {
        return (a <= obj.a && b <= obj.b);
    }

    bool operator>=(HinhHoc &obj)
    {
        return (a >= obj.a && b >= obj.b);
    }

    int getA()
    {
        return a;
    }

    int getB()
    {
        return b;
    }

    void setInfo(int a, int b)
    {
        this->a = a;
        this->b = b;
    }

    virtual void nhap()
    {
        cout << "Nhap a: ";
        cin >> a;
        cout << "Nhap b: ";
        cin >> b;
    }
    virtual void xuat()
    {
        cout << "a = " << a << endl;
        cout << "b = " << b << endl;
    }

    // Qua tai nhap xuat
    friend istream &operator>>(istream &is, HinhHoc &hinh)
    {
        cout << "Nhap a: ";
        is >> hinh.a;
        cout << "Nhap b: ";
        is >> hinh.b;
        return is;
    }
    friend ostream &operator<<(ostream &os, HinhHoc &hinh)
    {
        os << "a = " << hinh.a << endl;
        os << "b = " << hinh.b << endl;
        return os;
    }
};

class HinhChuNhat : public HinhHoc
{
public:
    HinhChuNhat() : HinhHoc()
    {
    }

    HinhChuNhat(int a, int b) : HinhHoc(a, b)
    {
    }

    void nhap()
    {
        HinhHoc::nhap();
    }

    void xuat()
    {
        HinhHoc::xuat();
        cout << "s = " << getA() * getB() << endl;
    }
};

int main()
{
    HinhHoc *hinh[2] = {new HinhHoc(), new HinhChuNhat()};

    for (int i = 0; i < 2; i++)
    {
        cout << "===== HINH " << i + 1 << " =====" << endl;
        hinh[i]->nhap();
    }

    for (int i = 0; i < 2; i++)
    {
        cout << "===== HINH " << i + 1 << " =====" << endl;
        hinh[i]->xuat();
    }

    // Xuat file txt
    fstream fout;
    fout.open("hinh.txt", ios::out);
    for (int i = 0; i < 2; i++)
    {
        fout << hinh[i]->getA() << " " << hinh[i]->getB() << endl;
    }
    fout.close();

    // Doc file txt
    HinhHoc *hinh2[2];
    fstream fin;
    fin.open("hinh.txt", ios::in);
    for (int i = 0; i < 2; i++)
    {
        int a, b;
        fin >> a >> b;
        hinh2[i] = new HinhChuNhat(a, b);
    }
    fin.close();

    cout << "Doc file TXT" << endl;
    for (int i = 0; i < 2; i++)
    {
        cout << "===== HINH " << i + 1 << " =====" << endl;
        hinh2[i]->xuat();
    }

    // xuat file dat
    fstream fout2;
    fout2.open("hinh.dat", ios::out | ios::binary);
    for (int i = 0; i < 2; i++)
    {
        fout2.write((char *)hinh[i], sizeof(HinhHoc));
    }
    fout2.close();

    // Doc file dat
    HinhHoc *hinh3[2];
    fstream fin2;
    fin2.open("hinh.dat", ios::in | ios::binary);
    for (int i = 0; i < 2; i++)
    {
        fin2.read(reinterpret_cast<char *>(hinh3[i]), sizeof(HinhChuNhat));
    }
    fin2.close();

    cout << "Doc file DAT" << endl;
    for (int i = 0; i < 2; i++)
    {
        cout << "===== HINH " << i + 1 << " =====" << endl;
        hinh3[i]->xuat();
    }

    // So sanh 2 hinh
    HinhHoc h3(1, 2), h4(1, 2), h5(3, 4);
    cout << "So sanh 2 hinh" << endl;
    cout << "h3 == h4: " << (h3 == h4) << endl;
    cout << "h3 != h4: " << (h3 != h4) << endl;
    cout << "h3 < h4: " << (h3 < h4) << endl;
    cout << "h3 > h4: " << (h3 > h4) << endl;
    cout << "h3 <= h4: " << (h3 <= h4) << endl;
    cout << "h3 >= h4: " << (h3 >= h4) << endl;
    cout << endl;
    cout << "h3 < h5: " << (h3 < h5) << endl;
    cout << "h3 > h5: " << (h3 > h5) << endl;
    cout << "h3 <= h5: " << (h3 <= h5) << endl;
    cout << "h3 >= h5: " << (h3 >= h5) << endl;
    cout << "h3 == h5: " << (h3 == h5) << endl;
    cout << "h3 != h5: " << (h3 != h5) << endl;

    return 0;
}