foo.cc: In member function ‘Complex Complex::operator*(const Complex&)’:
foo.cc:22:9: error: expected ‘;’ before ‘}’ token
   22 |         }
      |         ^
foo.cc: In function ‘std::ostream& operator<<(std::ostream&, const Complex&)’:
foo.cc:26:20: error: invalid use of non-static data member ‘Complex::b’
   26 |                 if(b>=0)
      |                    ^
foo.cc:8:13: note: declared here
    8 |         int b;
      |             ^