/in/foo.cc:3:2: error: expected unqualified-id before 'while'
    3 |  while(cin>>n)
      |  ^~~~~
/in/foo.cc:9:2: error: expected unqualified-id before 'return'
    9 |  return 0;
      |  ^~~~~~
/in/foo.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^