bit_manipulation.is_even

Functions

is_even(→ bool)	Return True if the input integer is even using a bitwise check.
is_even_using_shift_operator(→ bool)	Returns True if the input integer is even.

Module Contents

bit_manipulation.is_even.is_even(number: int) → bool

Return True if the input integer is even using a bitwise check.

Explanation: In binary, even numbers always have the least significant bit cleared (0), while odd numbers have it set (1). Therefore, n & 1 == 0 implies even.

>>> is_even(1)
False
>>> is_even(4)
True
>>> is_even(9)
False
>>> is_even(15)
False
>>> is_even(40)
True
>>> is_even(100)
True
>>> is_even(101)
False
>>> is_even(True)
Traceback (most recent call last):
    ...
TypeError: input must be an integer
>>> is_even(3.14)
Traceback (most recent call last):
    ...
TypeError: input must be an integer

bit_manipulation.is_even.is_even_using_shift_operator(number: int) → bool

Returns True if the input integer is even.

Explanation: In binary, even numbers end with 0, odd numbers end with 1. Examples: 2 -> 10 3 -> 11 4 -> 100 5 -> 101

For odd numbers, the last bit is always 1. Using shift: (n >> 1) << 1 removes the last bit. If result equals n, n is even.

>>> is_even_using_shift_operator(1)
False
>>> is_even_using_shift_operator(4)
True
>>> is_even_using_shift_operator(9)
False
>>> is_even_using_shift_operator(15)
False
>>> is_even_using_shift_operator(40)
True
>>> is_even_using_shift_operator(100)
True
>>> is_even_using_shift_operator(101)
False