Eroare de compilare: user.cpp: In function `int main(int, char**)': user.cpp:7: error: `ifstream' undeclared (first use this function) user.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.) user.cpp:7: error: parse error before `(' token user.cpp:8: error: `ofstream' undeclared (first use this function) user.cpp:9: error: `fin' undeclared (first use this function) user.cpp:14: error: `fout' undeclared (first use this function)