Eroare de compilare: user.cpp: In function 'int main()': user.cpp:24: error: no match for 'operator=' in 'f = (((std::ofstream*)operator new(276u)), (<statement>, <anonymous>))' /usr/include/c++/4.2/iosfwd:89: note: candidates are: std::basic_ifstream<char, std::char_traits<char> >& std::basic_ifstream<char, std::char_traits<char> >::operator=(const std::basic_ifstream<char, std::char_traits<char> >&) user.cpp:25: error: conflicting declaration 'std::ofstream f' user.cpp:21: error: 'f' has a previous declaration as 'std::ifstream f' user.cpp:26: error: no match for 'operator<<' in 'f << cmmdc(a, b)'