/in/foo.cc:8:8: error: stray '\351' in program
  cout<<长边长是"<<y<<endl;
        ^
/in/foo.cc:8:9: error: stray '\225' in program
  cout<<长边长是"<<y<<endl;
         ^
/in/foo.cc:8:10: error: stray '\277' in program
  cout<<长边长是"<<y<<endl;
          ^
/in/foo.cc:8:11: error: stray '\350' in program
  cout<<长边长是"<<y<<endl;
           ^
/in/foo.cc:8:12: error: stray '\276' in program
  cout<<长边长是"<<y<<endl;
            ^
/in/foo.cc:8:13: error: stray '\271' in program
  cout<<长边长是"<<y<<endl;
             ^
/in/foo.cc:8:14: error: stray '\351' in program
  cout<<长边长是"<<y<<endl;
              ^
/in/foo.cc:8:15: error: stray '\225' in program
  cout<<长边长是"<<y<<endl;
               ^
/in/foo.cc:8:16: error: stray '\277' in program
  cout<<长边长是"<<y<<endl;
                ^
/in/foo.cc:8:17: error: stray '\346' in program
  cout<<长边长是"<<y<<endl;
                 ^
/in/foo.cc:8:18: error: stray '\230' in program
  cout<<长边长是"<<y<<endl;
                  ^
/in/foo.cc:8:19: error: stray '\257' in program
  cout<<长边长是"<<y<<endl;
                   ^
/in/foo.cc:8:20: warning: missing terminating " character
  cout<<长边长是"<<y<<endl;
                    ^
/in/foo.cc:8:20: error: missing terminating " character
  cout<<长边长是"<<y<<endl;
                    ^~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:9:2: error: expected primary-expression before 'return'
  return 0;
  ^~~~~~
/in/foo.cc:6:6: warning: unused variable 'y' [-Wunused-variable]
  int y=2*x;
      ^