What is “2's Complement”?

Question

I\'m in a computer systems course and have been struggling, in part, with Two\'s Complement. I want to understand it but everything I\'ve read hasn\'t brought the p

Answer 1

The simplest answer:

1111 + 1 = (1)0000. So 1111 must be -1. Then -1 + 1 = 0.

It's perfect to understand these all for me.