CODEWITHSUNDEEP
pythonbitwise-operatorsbitwise-not
newbie54
newbie54

Reputation: 23

Bitwise not operator doesn't flip bits

I am trying to use the bitwise not operator to flip the bits in 1.

I start with 1 (00000001) and add ~.

x = ~1
print(f'{x:08b}')

Result is -0000010.

Everything online tells me the result should be 11111110. Not sure what I can do wrong with putting ~ in front of a number.

I tried adding a step to make sure 1 shows up as 00000001, and it did:

a = 1
print(f'{a:08b}')
x = ~a
print(f'{x:08b}')

Really not sure how I can go wrong on this...

Upvotes: 1

Views: 190

Answers (1)

Kache
Kache

Reputation: 16687

https://docs.python.org/3/reference/expressions.html#unary-arithmetic-and-bitwise-operations

The unary ~ (invert) operator yields the bitwise inversion of its integer argument. The bitwise inversion of x is defined as -(x+1).

So it's behaving as expected, printing "negative-of-a positive 2's complement". It doesn't print in 2's complement negative because: Format negative integers in two's complement representation

Upvotes: 2

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