Introduction - If you have any usage issues, please Google them yourself
This time we complete a simple encryption program on the letter. First letter number and the lowercase letters a to z No. 1-26, the uppercase letters A to Z are numbered 27-52, so that each letter has a unique serial number when sending content, the function of the F (X ) = X* X+X+1 send letters serial number calculation, it will obtain a new serial number, the serial number and then the remainder of 52, the serial number is the serial number you want to send encrypted letters, so that we can achieve encryption role.