The secert of identity card number

The numbers or letters inside parentheses in an identification number are used for verification purposes, and they are obtained using the following method:

 

First, the alphanumeric characters before the parentheses are converted to numerical values, where A = 1, B = 2, and so on.

 

Each digit (including alphabetical characters) is multiplied by 8, 7, 6, 5, 4, 3, and 2, respectively.

 

The results are added together, and then divided by 11 to find the remainder.

 

Subtracting the remainder from 11 gives the number or letter inside the parentheses. If the resulting number is 10, it is represented by the letter A.

 

When the number is input into a computer, the computer program performs real-time calculations and verification. If the computed result does not match the number or letter inside the parentheses, it indicates that at least one digit was inputted incorrectly.