Eroare de compilare: user.cpp: In function ‘int EvalExp(char*)’: user.cpp:19:19: error: request for member ‘top’ in ‘s’, which is of non-class type ‘char*’ if (s.top() == -2) ^ user.cpp:21:19: error: request for member ‘pop’ in ‘s’, which is of non-class type ‘char*’ s.pop(); ^ user.cpp: In function ‘int main()’: user.cpp:63:15: error: variable ‘std::ifstream f’ has initializer but incomplete type ifstream f("test.in"); ^ user.cpp:64:15: error: ‘s’ was not declared in this scope f.getline(s, DIM); ^