Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:17:15: error: no match for ‘operator+’ (operand types are ‘int’ and ‘std::istringstream {aka std::basic_istringstream<char>}’) suma = suma + iss; ^ user.cpp:17:15: note: candidates are: In file included from /usr/include/c++/4.8/string:52:0, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/basic_string.h:2472:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, _CharT) operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, ^ /usr/include/c++/4.8/bits/basic_string.h:2472:5: note: template argument deduction/substitution failed: user.cpp:17:17: note: mismatched types ‘std::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’ suma = suma + iss; ^ In file included from /usr/include/c++/4.8/string:52:0, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/basic_string.h:2466:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, const _CharT*) operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, ^ /usr/include/c++/4.8/bits/basic_string.h:2466:5: note: template argument deduction/substitution failed: user.cpp:17:17: note: mismatched types ‘std::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’ suma = suma + iss; ^ In file included from /usr/include/c++/4.8/string:52:0, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/basic_string.h:2460:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, std::basic_string<_CharT, _Traits, _Alloc>&&) operator+(_CharT __lhs, ^ /usr/include/c++/4.8/bits/basic_string.h:2460:5: note: template argument deduction/substitution failed: user.cpp:17:17: note: ‘std::istringstream {aka std::basic_istringstream<char>}’ is not derived from ‘std::basic_string<_CharT, _Traits, _Alloc>’ suma = suma + iss; ^ In file included from /usr/include/c++/4.8/string:52:0, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41,