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When I enter bin(-3) it just shows -0b11.
Which is not what I want.
It just keeps that - sign and convert the number.
I want the actual representation of negative numbers.
Is there any method in python which does that?
936
Negative numbers are written with a leading one instead of a leading zero. So if you are using only 8 bits for your twos-complement numbers, then you treat patterns from "00000000" to "01111111" as the whole numbers from 0 to 127, and reserve "1xxxxxxx" for writing negative numbers.
The simplest is to simply use the leftmost digit of the number as a special value to represent the sign of the number: 0 = positive, 1 = negative. For example, a value of positive 12 (decimal) would be written as 01100 in binary, but negative 12 (decimal) would be written as 11100.
Two's Complement of a Signed Binary Number In two's complement, the positive numbers are exactly the same as before for unsigned binary numbers. A negative number, however, is represented by a binary number, which when added to its corresponding positive equivalent results in zero.
If the number is negative then it is represented using 1's complement. First represent the number with positive sign and then take 1's complement of that number. (ii) Take 1's complement of 0 0101 and that is 1 1010. MSB is 1 which indicates that number is negative.
Depending on how many binary digit you want, subtract from a number (2n):
>>> bin((1 << 8) - 1)
'0b11111111'
>>> bin((1 << 16) - 1)
'0b1111111111111111'
>>> bin((1 << 32) - 1)
'0b11111111111111111111111111111111'
UPDATE
Using following expression, you can cover both positive and negative case:
>>> bin(((1 << 32) - 1) & -5)
'0b11111111111111111111111111111011'
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