Want to visit hong kong and macau

Hello dear

We are two from India planned to visit canton fair in china we also wants to visit Hong Kong and Macau. We required only china visa which we had applied, but that is single entry. I want to know that if it is possible that we first land to china and then go to hong kong then to macau after than again go to china to came back India. Do we require another visa for re-enter in china as we booked air tickets for up and down.