Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:9: error: ‘ifstream’ was not declared in this scope user.cpp:9: error: expected ‘;’ before ‘f’ user.cpp:10: error: ‘ofstream’ was not declared in this scope user.cpp:10: error: expected ‘;’ before ‘g’ user.cpp:12: error: ‘f’ was not declared in this scope user.cpp:15: warning: comparison between signed and unsigned integer expressions user.cpp:15: error: ‘g’ was not declared in this scope user.cpp:17: error: ‘g’ was not declared in this scope