ostream& ClassObject::output(ostream& os) const
{
    os << "Details";
    return os;
}

#include "ClassObject"
#include <fstream>
#include <iostream>

using namespace std;

int main()
{
     ClassObject ob;
     cout << ob; // print info to console window

     // save info to .txt file
     ofstream fileout;
     fileout.open("filename.txt", ios::app);
     fileout << ob;
     fileout.close();

     return 0;
}