foo.cc:7:17: error: stray '\357' in program
    7 | if(a<=100&&a>=90）
      |                 ^
foo.cc:7:18: error: stray '\274' in program
    7 | if(a<=100&&a>=90）
      |                  ^
foo.cc:7:19: error: stray '\211' in program
    7 | if(a<=100&&a>=90）
      |                   ^
foo.cc:10:15: error: stray '\357' in program
   10 | if(a<90&&a>=80）
      |               ^
foo.cc:10:16: error: stray '\274' in program
   10 | if(a<90&&a>=80）
      |                ^
foo.cc:10:17: error: stray '\211' in program
   10 | if(a<90&&a>=80）
      |                 ^
foo.cc:12:15: error: stray '\357' in program
   12 | if(a<80&&a>=70）
      |               ^
foo.cc:12:16: error: stray '\274' in program
   12 | if(a<80&&a>=70）
      |                ^
foo.cc:12:17: error: stray '\211' in program
   12 | if(a<80&&a>=70）
      |                 ^
foo.cc:14:16: error: stray '\357' in program
   14 | if(a<=70&&a>=60）
      |                ^
foo.cc:14:17: error: stray '\274' in program
   14 | if(a<=70&&a>=60）
      |                 ^
foo.cc:14:18: error: stray '\211' in program
   14 | if(a<=70&&a>=60）
      |                  ^
foo.cc: In function 'int main()':
foo.cc:6:4: error: no match for 'operator>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
    6 | cin>a;
      | ~~~^~
      | |   |
      | |   int
      | std::istream {aka std::basic_istream<char>}
foo.cc:6:4: note: candidate: 'operator>(int, int)' <built-in>
    6 | cin>a;
      | ~~~^~
foo.cc:6:4: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'int'
In file included from /usr/include/c++/9/bits/stl_algobase.h:64,
                 from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/stl_pair.h:467:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator>(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)'
  467 |     operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_pair.h:467:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::pair<_T1, _T2>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/stl_iterator.h:343:5: note: candidate: 'template<class _Iterator> bool std::operator>(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)'
  343 |     operator>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:343:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/stl_iterator.h:381:5: note: candidate: 'template<class _IteratorL, class _IteratorR> bool std::operator>(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)'
  381 |     operator>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:381:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/stl_iterator.h:1184:5: note: candidate: 'template<class _IteratorL, class _IteratorR> bool std::operator>(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)'
 1184 |     operator>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:1184:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/stl_iterator.h:1190:5: note: candidate: 'template<class _Iterator> bool std::operator>(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)'
 1190 |     operator>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:1190:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/basic_string.h:6267:5: 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>&)'
 6267 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/basic_string.h:6267:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/basic_string.h:6280:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)'
 6280 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/basic_string.h:6280:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
    6 | cin>a;
      |     ^
In file included from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from foo.cc:1:
/usr/include/c++/9/bits/basic_string.h:6292:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
 6292 |     operator>(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/basic_string.h:6292:5: note:   template argument deduction/substitution failed:
foo.cc:6:5: note:   mismatched types 'const _CharT*' and 'std::basic_istream<char>'
    6 | cin>a;
      |     ^
foo.cc:7:4: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17'
    7 | if(a<=100&&a>=90）
      |    ^
foo.cc:7:17: error: expected ';' before 'cout'
    7 | if(a<=100&&a>=90）
      |                 ^
      |                 ;
    8 | cout<<"A";
      | ~~~~             
foo.cc:7:10: warning: statement has no effect [-Wunused-value]
    7 | if(a<=100&&a>=90）
      |    ~~~~~~^~~~~~~
foo.cc:10:1: error: expected primary-expression before 'if'
   10 | if(a<90&&a>=80）
      | ^~
foo.cc:8:11: error: expected ')' before 'if'
    8 | cout<<"A";
      |           ^
      |           )
    9 | 
   10 | if(a<90&&a>=80）
      | ~~         
foo.cc:7:3: note: to match this '('
    7 | if(a<=100&&a>=90）
      |   ^
foo.cc:12:4: warning: init-statement in selection statements only available with '-std=c++17' or '-std=gnu++17'
   12 | if(a<80&&a>=70）
      |    ^
foo.cc:12:15: error: expected ';' before 'cout'
   12 | if(a<80&&a>=70）
      |               ^
      |               ;
   13 | cout<<"C";
      | ~~~~           
foo.cc:12:8: warning: statement has no effect [-Wunused-value]
   12 | if(a<80&&a>=70）
      |    ~~~~^~~~~~~
foo.cc:14:1: error: expected primary-expression before 'if'
   14 | if(a<=70&&a>=60）
      | ^~
foo.cc:13:11: error: expected ')' before 'if'
   13 | cout<<"C";
      |           ^
      |           )
   14 | if(a<=70&&a>=60）
      | ~~         
foo.cc:12:3: note: to match this '('
   12 | if(a<80&&a>=70）
      |   ^

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