Hong Kong and Macau - chinese Yuan / Renminbi as currency ?

Are Hong Kong and Macau using chinese Yuan / Renminbi as their currency ?

Hong Kong and Macau are part of China, but they have their own currencies.

The official currency of Hong Kong is Hong Kong Dollar - HKD.

Macau is using Macanese pataca - MOP.

Because of that, Yuan or Renminbi may be not accepted as a currency, when making cash payments in these countries. It is better to have some domestic currency with you.