/in/foo.cc: In function 'int main()':
/in/foo.cc:6:7: error: expected ';' before 'a'
   cin a;
       ^
/in/foo.cc:6:8: warning: statement has no effect [-Wunused-value]
   cin a;
        ^
/in/foo.cc:7:7: error: could not convert 'a.std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=<char, std::char_traits<char>, std::allocator<char> >(((const char*)"\37777777747\37777777614\37777777652\37777777751\37777777674\37777777673\37777777745\37777777655\37777777620\37777777743\37777777600\37777777602"))' from 'std::__cxx11::basic_string<char>' to 'bool'
   if(a="猪鼻子。");{
      ~^~~~~~~~~~~~~~~
/in/foo.cc:7:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(a="猪鼻子。");{
   ^~
/in/foo.cc:7:24: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if(a="猪鼻子。");{
                        ^