Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:10:12: error: cannot convert ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length<char, std::char_traits<char>, std::allocator<char> >’ from type ‘std::__cxx11::basic_string<char>::size_type (std::__cxx11::basic_string<char>::)() const noexcept {aka unsigned int (std::__cxx11::basic_string<char>::)() const noexcept}’ to type ‘int’ int l=str.length; ^ user.cpp:10:6: warning: unused variable ‘l’ [-Wunused-variable] int l=str.length; ^