What is the check code in the short message?

codes, as data, are prone to input errors when they are input to computers or other devices. In order to reduce input errors, coding experts have invented various check and error detection methods and set check codes according to these methods.

any code with a check code is composed of an ontology code and a check code (such as an organization code). The ontology code is the number indicating the object of coding, and the check code is the number appended to the ontology code to check the accuracy of the ontology code in the input process. Each ontology code can only have one check code, and the check code is obtained through the specified mathematical relationship.

the checking principle of check code is: a checking program compiled according to the checking formula derived from the checking method is preset in the system. When the code with check code is input into the system, the system uses the checking program to calculate the input ontology code to obtain the checking result, and then compares the checking result with the check code of the input code to check whether the input is correct or not. If they are consistent, it means that the code is entered correctly and the system is allowed to enter; if they are inconsistent, it means that the code is entered incorrectly, and the system refuses to enter and requires the code to be re-entered.