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glassdoor 2014

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Mari Wahl 2015-01-06 00:49:32 -05:00
parent ee01cd9446
commit 4b1fe33f96
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src/extra_interview_problems/bitwise/get_bit.py
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#!/usr/bin/python
''' Get a bit in a binary number:
1) Shifts 1 over by i bits
2) make an AND with the number
3) all the other than the bit at i are clean, now compare to 0
4) if the new value is not 0, bit i is 1
'''
def get_bit(num, i):
mask = 1 << i
return num & mask != 0
if __name__ == '__main__':
num = int('0100100', 2)
get_bit(num, 0) # 0
get_bit(num, 1) # 0
get_bit(num, 2) # 1
get_bit(num, 3) # 0
get_bit(num, 4) # 0
get_bit(num, 5) # 1
get_bit(num, 6) # 0