In this video you will understand the various integer encodings, character encoding and limits used in c programming.
https://www.utf8-chartable.de/
https://www.keil.com/support/man/docs/ARMCC/armcc_chr1359124241911.htm
-~-~~-~~~-~~-~-
Please watch: "const and constant literals in C/C++"
https://www.youtube.com/watch?v=wKGkAyMXXxc
-~-~~-~~~-~~-~-