Binary File Read and Write and class struct

 

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


    class  MyStruct
    {
        public:
            int a;//2
        float b;//4
        double c;//8
    }obj, obj2;

    struct  test
    {
        public:
            int a;
        int b;
        int c;
        virtual void Sum() {
        cout << "test=" << (1 + 1) << endl;
    }
    }rt;

    struct  test2 :test
    {
        private:
            int a1;
        public:
            int b2;
        int c3;
        test2() {
        cout << "Constructor" << endl;
    }
        void TestM() {
        cout << "Test" << endl;
    }
        void Sum() override {
        cout << "test2=" << (11 + 11) << endl;
    }

        void SetAvalue(int a) {

    }
        ~test2() {
        cout << "Destructor" << endl;
    }

    };

    struct  test3 :test
    {
        public:
            int x;
        int y;
    }obj3;

    int main() {
        test2 test2_obj;
        test2_obj.Sum();
        obj.a = 900;
        obj.b = 100;
        obj.c = 22000;

        ofstream file("abc.txt", ios::binary | ios::out);

        if (file.is_open()) {
            file.write(reinterpret_cast<char*>(&obj), sizeof(obj));
            file.close();
            cout << "File Create Sucess.";
        }

        //=============Read===========

        ifstream file_read("abc.txt", ios::binary | ios::out);

        if (file_read.is_open()) {
            file_read.read(reinterpret_cast<char*>(&obj2), sizeof(obj2));
            file_read.close();
            cout << "File Read Sucess.";
        }


        cout << "A=" << obj2.a << endl;
        cout << "C=" << obj2.b << endl;
        cout << "B=" << obj2.c << endl;

        return 0;
    }