Eroare de compilare: user.cpp:4:13: error: variable ‘std::ifstream fin’ has initializer but incomplete type ifstream fin("adunare.in"); ^ user.cpp:5:14: error: variable ‘std::ofstream fout’ has initializer but incomplete type ofstream fout("adunare.out"); ^ user.cpp: In function ‘int main()’: user.cpp:7:7: error: ‘A’ was not declared in this scope {fin>>A>>B; ^ user.cpp:7:10: error: ‘B’ was not declared in this scope {fin>>A>>B; ^