/in/foo.cc:1:1: error: 'include' does not name a type
 include <iostream>
 ^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:3: error: 'cin' was not declared in this scope
   cin>>d;
   ^~~
/in/foo.cc:18:4: error: 'cout' was not declared in this scope
    cout<<sum<<endl;
    ^~~~
/in/foo.cc:18:15: error: 'endl' was not declared in this scope
    cout<<sum<<endl;
               ^~~~