/in/foo.cc: In function 'int main()':
/in/foo.cc:16:17: error: break statement not within loop or switch
  cout<<31<<endl;break;
                 ^~~~~
/in/foo.cc:17:2: error: case label '4' not within a switch statement
  case 4:
  ^~~~
/in/foo.cc:18:2: error: case label '6' not within a switch statement
  case 6:
  ^~~~
/in/foo.cc:19:2: error: case label '9' not within a switch statement
  case 9:
  ^~~~
/in/foo.cc:20:2: error: case label '11' not within a switch statement
  case 11:
  ^~~~
/in/foo.cc:21:17: error: break statement not within loop or switch
  cout<<30<<endl;break;
                 ^~~~~
/in/foo.cc:22:2: error: case label '2' not within a switch statement
  case 2:cout<<28<<endl;
  ^~~~