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#include <iostream>
using namespace std;
 
int main() {
	int i;
	for(i=0; i=9;)
	cout < "Hello!"  <;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:7:7: error: no match for ‘operator<’ (operand types are ‘std::ostream {aka std::basic_ostream<char>}’ and ‘const char [7]’)
  cout < "Hello!"  <;
  ~~~~~^~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_pair.h:437:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^~~~~~~~
/usr/include/c++/6/bits/stl_pair.h:437:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::pair<_T1, _T2>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:298:5: note: candidate: template<class _Iterator> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator<(const reverse_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:298:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:355:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator<(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:355:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:1137:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator<(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:1137:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::move_iterator<_IteratorL>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:1143:5: note: candidate: template<class _Iterator> bool std::operator<(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator<(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:1143:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::move_iterator<_IteratorL>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5150:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5150:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5163:5: 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:5163:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’
  cout < "Hello!"  <;
         ^~~~~~~~
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5175:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator<(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5175:5: note:   template argument deduction/substitution failed:
prog.cpp:7:9: note:   mismatched types ‘const _CharT*’ and ‘std::basic_ostream<char>’
  cout < "Hello!"  <;
         ^~~~~~~~
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/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/system_error:200:3: 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:200:3: note:   no known conversion for argument 1 from ‘std::ostream {aka std::basic_ostream<char>}’ to ‘const std::error_code&’
/usr/include/c++/6/system_error:274:3: note: candidate: bool std::operator<(const std::error_condition&, const std::error_condition&)
   operator<(const error_condition& __lhs,
   ^~~~~~~~
/usr/include/c++/6/system_error:274:3: note:   no known conversion for argument 1 from ‘std::ostream {aka std::basic_ostream<char>}’ to ‘const std::error_condition&’
prog.cpp:7:20: error: expected primary-expression before ‘;’ token
  cout < "Hello!"  <;
                    ^

Standard output is empty