/in/foo.cc:10:9: warning: integer constant is too large for its type
   cout<<18446744073709551616;
         ^~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:6:7: error: 'a' was not declared in this scope
  cin>>a>>b;
       ^
/in/foo.cc:6:10: error: 'b' was not declared in this scope
  cin>>a>>b;
          ^