Explanation of Bitwise NOT Operator

Question

Why is it that the bitwise NOT operator (~ in most languages) converts the following values like so:

-2 -> 1
-1 -> 0

Answer 1

This is due to how negative numbers are represented as bits. For this most commonly Two's Complements are used.

-2 happens to be 1111110 in this notation, which negated is 1