mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
101 lines
2.3 KiB
Python
101 lines
2.3 KiB
Python
#!/usr/bin/env python3
|
||
|
||
"""Provide the functionality to manipulate a single bit."""
|
||
|
||
|
||
def set_bit(number: int, position: int) -> int:
|
||
"""
|
||
Set the bit at position to 1.
|
||
|
||
Details: perform bitwise or for given number and X.
|
||
Where X is a number with all the bits – zeroes and bit on given
|
||
position – one.
|
||
|
||
>>> set_bit(0b1101, 1) # 0b1111
|
||
15
|
||
>>> set_bit(0b0, 5) # 0b100000
|
||
32
|
||
>>> set_bit(0b1111, 1) # 0b1111
|
||
15
|
||
"""
|
||
return number | (1 << position)
|
||
|
||
|
||
def clear_bit(number: int, position: int) -> int:
|
||
"""
|
||
Set the bit at position to 0.
|
||
|
||
Details: perform bitwise and for given number and X.
|
||
Where X is a number with all the bits – ones and bit on given
|
||
position – zero.
|
||
|
||
>>> clear_bit(0b10010, 1) # 0b10000
|
||
16
|
||
>>> clear_bit(0b0, 5) # 0b0
|
||
0
|
||
"""
|
||
return number & ~(1 << position)
|
||
|
||
|
||
def flip_bit(number: int, position: int) -> int:
|
||
"""
|
||
Flip the bit at position.
|
||
|
||
Details: perform bitwise xor for given number and X.
|
||
Where X is a number with all the bits – zeroes and bit on given
|
||
position – one.
|
||
|
||
>>> flip_bit(0b101, 1) # 0b111
|
||
7
|
||
>>> flip_bit(0b101, 0) # 0b100
|
||
4
|
||
"""
|
||
return number ^ (1 << position)
|
||
|
||
|
||
def is_bit_set(number: int, position: int) -> bool:
|
||
"""
|
||
Is the bit at position set?
|
||
|
||
Details: Shift the bit at position to be the first (smallest) bit.
|
||
Then check if the first bit is set by anding the shifted number with 1.
|
||
|
||
>>> is_bit_set(0b1010, 0)
|
||
False
|
||
>>> is_bit_set(0b1010, 1)
|
||
True
|
||
>>> is_bit_set(0b1010, 2)
|
||
False
|
||
>>> is_bit_set(0b1010, 3)
|
||
True
|
||
>>> is_bit_set(0b0, 17)
|
||
False
|
||
"""
|
||
return ((number >> position) & 1) == 1
|
||
|
||
|
||
def get_bit(number: int, position: int) -> int:
|
||
"""
|
||
Get the bit at the given position
|
||
|
||
Details: perform bitwise and for the given number and X,
|
||
Where X is a number with all the bits – zeroes and bit on given position – one.
|
||
If the result is not equal to 0, then the bit on the given position is 1, else 0.
|
||
|
||
>>> get_bit(0b1010, 0)
|
||
0
|
||
>>> get_bit(0b1010, 1)
|
||
1
|
||
>>> get_bit(0b1010, 2)
|
||
0
|
||
>>> get_bit(0b1010, 3)
|
||
1
|
||
"""
|
||
return int((number & (1 << position)) != 0)
|
||
|
||
|
||
if __name__ == "__main__":
|
||
import doctest
|
||
|
||
doctest.testmod()
|