Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:17:27: error: ‘ios’ has not been declared fin.open("cmmdc.in" , ios::in ) ; ^ user.cpp:18:29: error: ‘ios’ has not been declared fout.open("cmmdc.out" , ios::out ) ; ^ user.cpp:19:12: error: ‘a’ was not declared in this scope fin >> a >> b ; ^ user.cpp:19:17: error: ‘b’ was not declared in this scope fin >> a >> b ; ^