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check whether integer is even or odd using bit manupulation #7099
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even_or_not file added
ab206a0
Updated DIRECTORY.md
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modified DIRECTORY.md
a698156
Merge branch 'TheAlgorithms:master' into main
Lauquik dc1cb60
Update bit_manipulation/even_or_not.py
cclauss 1e12407
updating DIRECTORY.md
03e34d5
Rename even_or_not.py to is_even.py
cclauss 484581d
updating DIRECTORY.md
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Original file line number | Diff line number | Diff line change |
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def is_even(number: int) -> bool: | ||
""" | ||
return true if the input integer is even | ||
Explanation: Lets take a look at the following deicmal to binary conversions | ||
2 => 10 | ||
14 => 1110 | ||
100 => 1100100 | ||
3 => 11 | ||
13 => 1101 | ||
101 => 1100101 | ||
from the above examples we can observe that | ||
for all the odd integers there is always 1 set bit at the end | ||
also, 1 in binary can be represented as 001, 00001, or 0000001 | ||
so for any odd integer n => n&1 is always equlas 1 else the integer is 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 | ||
""" | ||
if number & 1 == 0: | ||
return True | ||
else: | ||
return False | ||
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if __name__ == "__main__": | ||
import doctest | ||
|
||
doctest.testmod() |
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