Eroare de compilare: user.cpp: In constructor ‘Stiva::Stiva()’: user.cpp:16: error: class ‘Stiva’ does not have any field named ‘stack’ user.cpp: In member function ‘void Stiva::push(char)’: user.cpp:21: error: ‘template<class _Tp, class _Sequence> class std::stack’ used without template parameters user.cpp: In member function ‘void Stiva::pop()’: user.cpp:27: error: ‘template<class _Tp, class _Sequence> class std::stack’ used without template parameters user.cpp: In member function ‘char& Stiva::top()’: user.cpp:33: error: ‘template<class _Tp, class _Sequence> class std::stack’ used without template parameters user.cpp: In member function ‘void Stiva::clear()’: user.cpp:43: error: ‘template<class _Tp, class _Sequence> class std::stack’ used without template parameters