Main.cc: In function 'int main()':
Main.cc:6:19: error: no match for 'operator!=' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'const char [4]')
6 | while((cin>>i)!="EOF")
| ~~~~~~~~^~~~~~~
| | |
| | const char [4]
| std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
In file included from /usr/include/c++/12.2.1/iosfwd:40,
from /usr/include/c++/12.2.1/ios:38,
from /usr/include/c++/12.2.1/ostream:38,
from /usr/include/c++/12.2.1/iostream:39,
from Main.cc:1:
/usr/include/c++/12.2.1/bits/postypes.h:197:5: note: candidate: 'template<class _StateT> bool std::operator!=(const fpos<_StateT>&, const fpos<_StateT>&)'
197 | operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/postypes.h:197:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::fpos<_StateT>'
6 | while((cin>>i)!="EOF")
| ^~~~~
In file included from /usr/include/c++/12.2.1/string:41,
from /usr/include/c++/12.2.1/bits/locale_classes.h:40,
from /usr/include/c++/12.2.1/bits/ios_base.h:41,
from /usr/include/c++/12.2.1/ios:42:
/usr/include/c++/12.2.1/bits/allocator.h:226:5: note: candidate: 'template<class _T1, class _T2> bool std::operator!=(const allocator<_CharT>&, const allocator<_T2>&)'
226 | operator!=(const allocator<_T1>&, const allocator<_T2>&)
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/allocator.h:226:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::allocator<_CharT>'
6 | while((cin>>i)!="EOF")
| ^~~~~
In file included from /usr/include/c++/12.2.1/string:47:
/usr/include/c++/12.2.1/bits/stl_iterator.h:458:5: note: candidate: 'template<class _Iterator> bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
458 | operator!=(const reverse_iterator<_Iterator>& __x,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:458:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
6 | while((cin>>i)!="EOF")
| ^~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:503:5: note: candidate: 'template<class _IteratorL, class _IteratorR> bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
503 | operator!=(const reverse_iterator<_IteratorL>& __x,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:503:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
6 | while((cin>>i)!="EOF")
| ^~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:1675:5: note: candidate: 'template<class _IteratorL, class _IteratorR> bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
1675 | operator!=(const move_iterator<_IteratorL>& __x,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:1675:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
6 | while((cin>>i)!="EOF")
| ^~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:1741:5: note: candidate: 'template<class _Iterator> bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
1741 | operator!=(const move_iterator<_Iterator>& __x,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/stl_iterator.h:1741:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
6 | while((cin>>i)!="EOF")
| ^~~~~
In file included from /usr/include/c++/12.2.1/bits/stl_algobase.h:64,
from /usr/include/c++/12.2.1/string:50:
/usr/include/c++/12.2.1/bits/stl_pair.h:670:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
670 | operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/stl_pair.h:670:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::pair<_T1, _T2>'
6 | while((cin>>i)!="EOF")
| ^~~~~
In file included from /usr/include/c++/12.2.1/string:53:
/usr/include/c++/12.2.1/bits/basic_string.h:3653:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const __cxx11::basic_string<_CharT, _Traits, _Alloc>&, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
3653 | operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/basic_string.h:3653:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
6 | while((cin>>i)!="EOF")
| ^~~~~
/usr/include/c++/12.2.1/bits/basic_string.h:3666:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
3666 | operator!=(const _CharT* __lhs,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/basic_string.h:3666:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: mismatched types 'const _CharT*' and 'std::basic_istream<char>'
6 | while((cin>>i)!="EOF")
| ^~~~~
/usr/include/c++/12.2.1/bits/basic_string.h:3678:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const __cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)'
3678 | operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/basic_string.h:3678:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
6 | while((cin>>i)!="EOF")
| ^~~~~
In file included from /usr/include/c++/12.2.1/bits/locale_facets.h:48,
from /usr/include/c++/12.2.1/bits/basic_ios.h:37,
from /usr/include/c++/12.2.1/ios:44:
/usr/include/c++/12.2.1/bits/streambuf_iterator.h:241:5: note: candidate: 'template<class _CharT, class _Traits> bool std::operator!=(const istreambuf_iterator<_CharT, _Traits>&, const istreambuf_iterator<_CharT, _Traits>&)'
241 | operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
| ^~~~~~~~
/usr/include/c++/12.2.1/bits/streambuf_iterator.h:241:5: note: template argument deduction/substitution failed:
Main.cc:6:21: note: 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
6 | while((cin>>i)!="EOF")
| ^~~~~
In file included from /usr/include/c++/12.2.1/bits/ios_base.h:46:
/usr/include/c++/12.2.1/system_error:416:3: note: candidate: 'bool std::operator!=(const error_code&, const error_code&)'
416 | operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
| ^~~~~~~~
/usr/include/c++/12.2.1/system_error:416:32: note: no known conversion for argument 1 from 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} to 'const std::error_code&'
416 | operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
| ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/12.2.1/system_error:421:3: note: candidate: 'bool std::operator!=(const error_code&, const error_condition&)'
421 | operator!=(const error_code& __lhs, const error_condition& __rhs) noexcept
| ^~~~~~~~
/usr/include/c++/12.2.1/system_error:421:32: note: no known conversion for argument 1 from 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} to 'const std::error_code&'
421 | operator!=(const error_code& __lhs, const error_condition& __rhs) noexcept
| ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/12.2.1/system_error:426:3: note: candidate: 'bool std::operator!=(const error_condition&, const error_code&)'
426 | operator!=(const error_condition& __lhs, const error_code& __rhs) noexcept
| ^~~~~~~~
/usr/include/c++/12.2.1/system_error:426:37: note: no known conversion for argument 1 from 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} to 'const std::error_condition&'
426 | operator!=(const error_condition& __lhs, const error_code& __rhs) noexcept
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/12.2.1/system_error:431:3: note: candidate: 'bool std::operator!=(const error_condition&, const error_condition&)'
431 | operator!=(const error_condition& __lhs,
| ^~~~~~~~
/usr/include/c++/12.2.1/system_error:431:37: note: no known conversion for argument 1 from 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} to 'const std::error_condition&'
431 | operator!=(const error_condition& __lhs,
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
Main.cc:8:21: error: unable to find numeric literal operator 'operator""\U0000ff1b'
8 | sum=(1+n)*n*0.5；
| ^~~~~
Main.cc:8:21: note: use '-fext-numeric-literals' to enable more built-in suffixes