Main.cc: In function ‘int main()’:
Main.cc:7:9: error: no match for ‘operator>>’ (operand types are ‘std::ostream {aka std::basic_ostream}’ and ‘int’)
cout>>4>>2;
~~~~^~~
Main.cc:7:9: note: candidate: operator>>(int, int)
Main.cc:7:9: note: no known conversion for argument 1 from ‘std::ostream {aka std::basic_ostream}’ to ‘int’
In file included from /usr/include/c++/7/string:53:0,
from /usr/include/c++/7/bits/locale_classes.h:40,
from /usr/include/c++/7/bits/ios_base.h:41,
from /usr/include/c++/7/ios:42,
from /usr/include/c++/7/ostream:38,
from /usr/include/c++/7/iostream:39,
from Main.cc:1:
/usr/include/c++/7/bits/basic_string.tcc:1465:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
operator>>(basic_istream<_CharT, _Traits>& __in,
^~~~~~~~
/usr/include/c++/7/bits/basic_string.tcc:1465:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
cout>>4>>2;
^
In file included from /usr/include/c++/7/istream:991:0,
from /usr/include/c++/7/iostream:40,
from Main.cc:1:
/usr/include/c++/7/bits/istream.tcc:963:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
^~~~~~~~
/usr/include/c++/7/bits/istream.tcc:963:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
cout>>4>>2;
^
In file included from /usr/include/c++/7/istream:991:0,
from /usr/include/c++/7/iostream:40,
from Main.cc:1:
/usr/include/c++/7/bits/istream.tcc:931:5: note: candidate: template std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
^~~~~~~~
/usr/include/c++/7/bits/istream.tcc:931:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
cout>>4>>2;
^
In file included from /usr/include/c++/7/iostream:40:0,
from Main.cc:1:
/usr/include/c++/7/istream:756:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, unsigned char&)
operator>>(basic_istream& __in, unsigned char& __c)
^~~~~~~~
/usr/include/c++/7/istream:756:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream’
cout>>4>>2;
^
In file included from /usr/include/c++/7/iostream:40:0,
from Main.cc:1:
/usr/include/c++/7/istream:761:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, signed char&)
operator>>(basic_istream& __in, signed char& __c)
^~~~~~~~
/usr/include/c++/7/istream:761:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream’
cout>>4>>2;
^
In file included from /usr/include/c++/7/iostream:40:0,
from Main.cc:1:
/usr/include/c++/7/istream:803:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, unsigned char*)
operator>>(basic_istream& __in, unsigned char* __s)
^~~~~~~~
/usr/include/c++/7/istream:803:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream’
cout>>4>>2;
^
In file included from /usr/include/c++/7/iostream:40:0,
from Main.cc:1:
/usr/include/c++/7/istream:808:5: note: candidate: template std::basic_istream& std::operator>>(std::basic_istream&, signed char*)
operator>>(basic_istream& __in, signed char* __s)
^~~~~~~~
/usr/include/c++/7/istream:808:5: note: template argument deduction/substitution failed:
Main.cc:7:11: note: ‘std::ostream {aka std::basic_ostream}’ is not derived from ‘std::basic_istream’
cout>>4>>2;
^
In file included from /usr/include/c++/7/iostream:40:0,
from Main.cc:1:
/usr/include/c++/7/istream:980:5: note: candidate: template typename std::enable_if >, std::__is_convertible_to_basic_istream<_Istream>, std::__is_extractable::__istream_type, _Tp&&, void> >::value, typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type>::type std::operator>>(_Istream&&, _Tp&&)
operator>>(_Istream&& __is, _Tp&& __x)
^~~~~~~~
/usr/include/c++/7/istream:980:5: note: template argument deduction/substitution failed:
/usr/include/c++/7/istream: In substitution of ‘template typename std::enable_if >, std::__is_convertible_to_basic_istream<_Istream>, std::__is_extractable::__istream_type, _Tp&&, void> >::value, typename std::__is_convertible_to_basic_istream<_Tp>::__istream_type>::type std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::basic_ostream&; _Tp = int]’:
Main.cc:7:11: required from here
/usr/include/c++/7/istream:980:5: error: no type named ‘type’ in ‘struct std::enable_if’
Main.cc:5:9: warning: unused variable ‘a’ [-Wunused-variable]
int a;
^
Main.cc:6:11: warning: unused variable ‘b’ [-Wunused-variable]
short b;
^