File Handing Read and Write Data and add new data

 #include<iostream>;

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

int main() {

    string olddata;
    //ios::in | ios::out | ios::trunc
    fstream file_obj("sabir.xml", ios::in | ios::out | ios::trunc);
    string line;
    if (file_obj.is_open()) {
        cout << "File is Open";
        file_obj << "Here a detailed overview and example of file handling in C++:";

        //====Read data========
        file_obj.seekg(0);
        getline(file_obj, line);
        cout << "Data=" << line;

        //======Write data====
        file_obj.seekp(5);
        file_obj << "new data ";


        //====Read data========
        file_obj.seekg(0);
        getline(file_obj, line);
        cout << "Data=" << line;


        ////====Read data=======
        //file_obj.seekg(5);
        //getline(file_obj, olddata);


        file_obj.close();
    }

    return 0;
}