Eroare de compilare: main.cpp: In function 'int main()': main.cpp:7:10: error: no match for 'operator>>' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'const char [6]') 7 | cout >> "a + b"; | ~~~~ ^~ ~~~~~~~ | | | | | const char [6] | std::ostream {aka std::basic_ostream<char>} In file included from /usr/include/c++/10/string:56, from /usr/include/c++/10/bits/locale_classes.h:40, from /usr/include/c++/10/bits/ios_base.h:41, from /usr/include/c++/10/ios:42, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from main.cpp:1: /usr/include/c++/10/bits/basic_string.tcc:1468:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)' 1468 | operator>>(basic_istream<_CharT, _Traits>& __in, | ^~~~~~~~ /usr/include/c++/10/bits/basic_string.tcc:1468:5: note: template argument deduction/substitution failed: main.cpp:7:13: note: 'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>' 7 | cout >> "a + b"; | ^~~~~~~ In file included from /usr/include/c++/10/istream:991, from /usr/include/c++/10/iostream:40, from main.cpp:1: /usr/include/c++/10/bits/istream.tcc:931:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)' 931 | operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c) | ^~~~~~~~ /usr/include/c++/10/bits/istream.tcc:931:5: note: template argument deduction/substitution failed: main.cpp:7:13: note: 'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>' 7 | cout >> "a + b"; | ^~~~~~~ In file included from /usr/include/c++/10/iostream:40, from main.cpp:1: /usr/include/c++/10/istream:756:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)' 756 | operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c) | ^~~~~~~~ /usr/include/c++/10/istream:756:5: note: template argument deduction/substitution failed: main.cpp:7:13: note: 'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<char, _Traits>' 7 | cout >> "a + b"; | ^~~~~~~ In file included from /usr/include/c++/10/iostream:40, from main.cpp:1: /usr/include/c++/10/istream:761:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)' 761 | operator>>(basic_istream<char, _Traits>& __in, signed char& __c) | ^~~~~~~~ /usr/include/c++/10/istream:761:5: note: template argument deduction/substitution failed: main.cpp:7:13: note: 'std::ostream' {aka 'std::basic_ostream<char>'} is not derived from 'std::basic_istream<char, _Traits>' 7 | cout >> "a + b"; | ^~~~~~~ In file included from /usr/include/c++/10/istream:991, Non zero exit status: 1