What is the number of Hong Kong identity card?

Hong Kong identity card number * * * six digits, plus the number in brackets * * * seven digits, preceded by English letter code. The letters or numbers in brackets are actually used to verify whether the previous letters or numbers are misspelled. The first seven digits of letters and numbers are calculated by weighted method, so the last digit is generally called verification number, which is used to verify the accuracy of the first seven digits of ID card.