Borderou de evaluare (job #641929)

Eroare de compilare: main.cpp: In function 'int main()': main.cpp:11:9: error: no match for 'operator<<' (operand types are 'std::ifstream' {aka 'std::basic_ifstream<char>'} and '__gnu_cxx::__promote_2<int, int, double, double>::__type' {aka 'double'}) 11 | fout<<pow(2,n-1); | ~~~~^~~~~~~~~~~~ | | | | | __gnu_cxx::__promote_2<int, int, double, double>::__type {aka double} | std::ifstream {aka std::basic_ifstream<char>} In file included from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/string:55, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/bits/locale_classes.h:40, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/bits/ios_base.h:41, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ios:42, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ostream:38, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/iostream:39, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/bits/basic_string.h:6530:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)' 6530 | operator<<(basic_ostream<_CharT, _Traits>& __os, | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/bits/basic_string.h:6530:5: note: template argument deduction/substitution failed: main.cpp:11:20: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 11 | fout<<pow(2,n-1); | ^ In file included from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/bits/ios_base.h:46, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ios:42, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ostream:38, from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/iostream:39, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/system_error:263:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)' 263 | operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e) | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/system_error:263:5: note: template argument deduction/substitution failed: main.cpp:11:20: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 11 | fout<<pow(2,n-1); | ^ In file included from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/iostream:39, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ostream:506:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)' 506 | operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c) | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ostream:506:5: note: template argument deduction/substitution failed: main.cpp:11:20: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 11 | fout<<pow(2,n-1); | ^ In file included from /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/iostream:39, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ostream:511:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)' 511 | operator<<(basic_ostream<_CharT, _Traits>& __out, char __c) | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11.2.0/include/g++-v11/ostream:511:5: note: template argument deduction/substitution failed: main.cpp:11:20: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 11 | fout<<pow(2,n-1);