/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^~~
/in/foo.cc:7:2: error: 'cout' was not declared in this scope
  cout<<n;
  ^~~~
/in/foo.cc:7:9: error: expected '}' at end of input
  cout<<n;
         ^