Bitwise Trick & Tips

Bitwise many times are asked in interviews, and they are useful for C programming too:

https://stackoverflow.com/questions/19061544/bitwise-anding-with-0xff-is-important

https://github.com/devwebcl/cc65-samples/blob/master/src/ghostbusters/ghostbcc.c

https://stackoverflow.com/questions/1533131/what-useful-bitwise-operator-code-tricks-should-a-developer-know-about