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Added binary shifts and twos complement functions to bit manipulation #4068

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Merged
dhruvmanila merged 9 commits into from
Feb 23, 2021
Merged

Added binary shifts and twos complement functions to bit manipulation #4068

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19c0aee
Added binary shifts and twos complement functions to bit manipulation…
Leyza Dec 27, 2020
ec0fe34
Fixed problem representing 0 wrong
Leyza Dec 27, 2020
6911d3b
More testing
Leyza Dec 27, 2020
73dbc93
Fixed problems
Leyza Dec 27, 2020
919af32
Fixed formatting
Leyza Dec 27, 2020
b7658fb
More format fixes
Leyza Dec 27, 2020
cbc0a39
Format fixes
Leyza Dec 27, 2020
b7750e1
Fixed docstrings and added url
Leyza Jan 31, 2021
b7ebf35
Minor change to url
Leyza Jan 31, 2021
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Fixed problem representing 0 wrong
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@Leyza
Leyza committed Dec 27, 2020
commit ec0fe34ffcb014949ba707293423e6eb032db74f
9 changes: 6 additions & 3 deletions bit_manipulation/binary_twos_complement.py
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Expand Up @@ -3,6 +3,8 @@ def twos_complement(a: int) -> str:
Take in a negative integer 'a'.
Return the two's complement representation of 'a'.

>>> twos_complement(0)
'0b0'
>>> twos_complement(-1)
'0b11'
>>> twos_complement(-5)
Expand All @@ -18,9 +20,10 @@ def twos_complement(a: int) -> str:
"""
if a > 0:
raise ValueError("input must be a negative integer")
bit_a_length = len(bin(a)[3:])
twos_complement_a = bin(abs(a) - (1 << bit_a_length))[3:]
twos_complement_a = '1' + '0' * (bit_a_length - len(twos_complement_a)) + twos_complement_a
binary_a_length = len(bin(a)[3:])
twos_complement_a = bin(abs(a) - (1 << binary_a_length))[3:]
twos_complement_a = ('1' + '0' * (binary_a_length - len(twos_complement_a)) +
twos_complement_a) if a < 0 else '0'
return '0b' + twos_complement_a


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