Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:101:6: error: no match for ‘operator>>’ (operand types are ‘std::ofstream {aka std::basic_ofstream<char>}’ and ‘long long int’) g>>sum; ^ user.cpp:101:6: note: candidates are: In file included from /usr/include/c++/4.8/string:53:0, 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.tcc:996:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&) operator>>(basic_istream<_CharT, _Traits>& __in, ^ /usr/include/c++/4.8/bits/basic_string.tcc:996:5: note: template argument deduction/substitution failed: user.cpp:101:8: note: ‘std::ofstream {aka std::basic_ofstream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’ g>>sum; ^ In file included from /usr/include/c++/4.8/istream:879:0, from /usr/include/c++/4.8/iostream:40, from user.cpp:1: /usr/include/c++/4.8/bits/istream.tcc:955:5: note: template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*) operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s) ^ /usr/include/c++/4.8/bits/istream.tcc:955:5: note: template argument deduction/substitution failed: user.cpp:101:8: note: ‘std::ofstream {aka std::basic_ofstream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’ g>>sum; ^ In file included from /usr/include/c++/4.8/istream:879:0, from /usr/include/c++/4.8/iostream:40, from user.cpp:1: /usr/include/c++/4.8/bits/istream.tcc:923:5: note: template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&) operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c) ^ /usr/include/c++/4.8/bits/istream.tcc:923:5: note: template argument deduction/substitution failed: user.cpp:101:8: note: ‘std::ofstream {aka std::basic_ofstream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’ g>>sum; ^ In file included from /usr/include/c++/4.8/iostream:40:0, from user.cpp:1: /usr/include/c++/4.8/istream:727:5: note: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&) operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c) ^ /usr/include/c++/4.8/istream:727:5: note: template argument deduction/substitution failed: user.cpp:101:8: note: ‘std::ofstream {aka std::basic_ofstream<char>}’ is not derived from ‘std::basic_istream<char, _Traits>’ g>>sum; ^ In file included from /usr/include/c++/4.8/iostream:40:0, from user.cpp:1: