foo.cc:19:9: error: ‘cout’ does not name a type
   19 |         cout<<result<<endl;
      |         ^~~~
foo.cc:20:5: error: expected unqualified-id before ‘return’
   20 |     return 0;
      |     ^~~~~~
foo.cc:21:1: error: expected declaration before ‘}’ token
   21 | }
      | ^