#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
int main()
{
ifstream file_in("data.json");
stringstream buffer;
buffer << file_in.rdbuf();
string contents = buffer.str();
file_in.close();
contents.pop_back();
contents.pop_back();
cout << contents << endl;
contents += ",'lorem4.4'}}";
cout << contents;
// możesz nadpisać ofstream file_out("data.json");
ofstream file_out("data_new.json"); // dla demonstracji inna nazwa
file_out << contents;
file_out.close();
return 0;
}
{{'lorem1.1','lorem1.2'},{'lorem 2.1','lorem2.2', lorem2.3'},{'lorem3.1','lorem3.2'},{'lorem4.1','lorem4.2','lorem4.3'}}
