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bit_manipulation/binary_twos_complement.py
43 строки
1 KB
Leyza
Added binary shifts and twos complement functions to bit manipulation (#4068)
23 фев 2021, 09:15
Не верифицирован
23 фев 2021, 09:15
02d9bc6
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# Information on 2's complement: https://en.wikipedia.org/wiki/Two%27s_complement def twos_complement(number: int) -> str: """ Take in a negative integer 'number'. Return the two's complement representation of 'number'. >>> twos_complement(0) '0b0' >>> twos_complement(-1) '0b11' >>> twos_complement(-5) '0b1011' >>> twos_complement(-17) '0b101111' >>> twos_complement(-207) '0b100110001' >>> twos_complement(1) Traceback (most recent call last): ... ValueError: input must be a negative integer """ if number > 0: raise ValueError("input must be a negative integer") binary_number_length = len(bin(number)[3:]) twos_complement_number = bin(abs(number) - (1 << binary_number_length))[3:] twos_complement_number = ( ( "1" + "0" * (binary_number_length - len(twos_complement_number)) + twos_complement_number ) if number < 0 else "0" ) return "0b" + twos_complement_number if __name__ == "__main__": import doctest doctest.testmod()