Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:9: error: conflicting declaration ‘std::ifstream f’ user.cpp:8: error: ‘f’ has a previous declaration as ‘std::fstream f’ user.cpp:10: error: conflicting declaration ‘std::ofstream g’ user.cpp:8: error: ‘g’ has a previous declaration as ‘std::fstream g’ user.cpp:55: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result