~ 10/14


#1

This lesson says it won’t go into detail about what ~ actually does in a computer but I’m curious if anyone knows of a good article that explains what it does.


#2

~ x
Returns the complement of x - the number you get by switching each 1 for a 0 and each 0 for a 1. This is the same as -x - 1.
BitwiseOperators

To understand the term, ‘complement’, refer to this Wiki…

Complement (set theory)

In particular, “complement of a set A refers to elements not in A.”

Consider the 32-bit pseudo-representation of 0, followed by its complement…

0b00000000000000000000000000000000
0b11111111111111111111111111111111    # ~0

To see how complement fit into binary, mathematically,

Two’s complement

It’s a pretty heady read, but give it your best shot to read it through at some time.


#3

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