060fd8ee2c
* Fix reverse_bits.py (#12868) * Update reverse_bits.py * Update reverse_bits.py * Update reverse_bits.py * Update reverse_bits.py * Update reverse_bits.py --------- Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
def get_reverse_bit_string(number: int) -> str:
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"""
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Return the reverse bit string of a 32 bit integer
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>>> get_reverse_bit_string(9)
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'10010000000000000000000000000000'
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>>> get_reverse_bit_string(43)
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'11010100000000000000000000000000'
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>>> get_reverse_bit_string(2873)
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'10011100110100000000000000000000'
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>>> get_reverse_bit_string(2550136832)
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'00000000000000000000000000011001'
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>>> get_reverse_bit_string("this is not a number")
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Traceback (most recent call last):
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...
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TypeError: operation can not be conducted on an object of type str
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"""
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if not isinstance(number, int):
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msg = (
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"operation can not be conducted on an object of type "
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f"{type(number).__name__}"
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)
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raise TypeError(msg)
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bit_string = ""
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for _ in range(32):
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bit_string += str(number % 2)
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number >>= 1
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return bit_string
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def reverse_bit(number: int) -> int:
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"""
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Take in a 32 bit integer, reverse its bits, return a 32 bit integer result
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>>> reverse_bit(25)
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2550136832
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>>> reverse_bit(37)
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2751463424
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>>> reverse_bit(21)
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2818572288
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>>> reverse_bit(58)
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1543503872
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>>> reverse_bit(0)
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0
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>>> reverse_bit(256)
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8388608
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>>> reverse_bit(2550136832)
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25
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>>> reverse_bit(-1)
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Traceback (most recent call last):
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...
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ValueError: The value of input must be non-negative
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>>> reverse_bit(1.1)
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Traceback (most recent call last):
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...
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TypeError: Input value must be an 'int' type
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>>> reverse_bit("0")
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Traceback (most recent call last):
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...
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TypeError: Input value must be an 'int' type
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"""
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if not isinstance(number, int):
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raise TypeError("Input value must be an 'int' type")
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if number < 0:
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raise ValueError("The value of input must be non-negative")
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result = 0
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# iterator over [0 to 31], since we are dealing with a 32 bit integer
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for _ in range(32):
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# left shift the bits by unity
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result <<= 1
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# get the end bit
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end_bit = number & 1
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# right shift the bits by unity
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number >>= 1
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# add that bit to our answer
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result |= end_bit
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return result
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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