Eroare de compilare: main.cpp: In function 'int main()': main.cpp:19:16: error: no match for 'operator==' (operand types are 'std::basic_ostream<char>' and 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}') os << word == s ? "beep" : s; ~~~~~~~~~~~^~~~ In file included from /usr/include/c++/6/bits/locale_facets.h:48:0, from /usr/include/c++/6/bits/basic_ios.h:37, from /usr/include/c++/6/ios:44, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:4: /usr/include/c++/6/bits/streambuf_iterator.h:204:5: note: candidate: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&) operator==(const istreambuf_iterator<_CharT, _Traits>& __a, ^~~~~~~~ /usr/include/c++/6/bits/streambuf_iterator.h:204:5: note: template argument deduction/substitution failed: main.cpp:19:19: note: 'std::basic_ostream<char>' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>' os << word == s ? "beep" : s; ^ In file included from /usr/include/c++/6/bits/ios_base.h:46:0, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:4: /usr/include/c++/6/system_error:303:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&) operator==(const error_condition& __lhs, ^~~~~~~~ /usr/include/c++/6/system_error:303:3: note: no known conversion for argument 1 from 'std::basic_ostream<char>' to 'const std::error_condition&' /usr/include/c++/6/system_error:296:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&) operator==(const error_condition& __lhs, const error_code& __rhs) noexcept ^~~~~~~~ /usr/include/c++/6/system_error:296:3: note: no known conversion for argument 1 from 'std::basic_ostream<char>' to 'const std::error_condition&' /usr/include/c++/6/system_error:289:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&) operator==(const error_code& __lhs, const error_condition& __rhs) noexcept ^~~~~~~~ /usr/include/c++/6/system_error:289:3: note: no known conversion for argument 1 from 'std::basic_ostream<char>' to 'const std::error_code&' /usr/include/c++/6/system_error:284:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&) operator==(const error_code& __lhs, const error_code& __rhs) noexcept ^~~~~~~~ /usr/include/c++/6/system_error:284:3: note: no known conversion for argument 1 from 'std::basic_ostream<char>' to 'const std::error_code&' In file included from /usr/include/c++/6/string:52:0, from main.cpp:1: /usr/include/c++/6/bits/basic_string.h:5102:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*) operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs, ^~~~~~~~ /usr/include/c++/6/bits/basic_string.h:5102:5: note: template argument deduction/substitution failed: main.cpp:19:19: note: 'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>' os << word == s ? "beep" : s; ^ In file included from /usr/include/c++/6/string:52:0, from main.cpp:1: /usr/include/c++/6/bits/basic_string.h:5090:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) Non zero exit status: 1