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60 lines
1.4 KiB
Python
60 lines
1.4 KiB
Python
"""Convert a Decimal Number to a Binary Number."""
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def decimal_to_binary(num: int) -> str:
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"""
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Convert an Integer Decimal Number to a Binary Number as str.
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>>> decimal_to_binary(0)
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'0b0'
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>>> decimal_to_binary(2)
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'0b10'
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>>> decimal_to_binary(7)
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'0b111'
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>>> decimal_to_binary(35)
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'0b100011'
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>>> # negatives work too
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>>> decimal_to_binary(-2)
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'-0b10'
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>>> # other floats will error
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>>> decimal_to_binary(16.16) # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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TypeError: 'float' object cannot be interpreted as an integer
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>>> # strings will error as well
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>>> decimal_to_binary('0xfffff') # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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TypeError: 'str' object cannot be interpreted as an integer
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"""
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if isinstance(num, float):
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raise TypeError("'float' object cannot be interpreted as an integer")
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if isinstance(num, str):
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raise TypeError("'str' object cannot be interpreted as an integer")
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if num == 0:
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return "0b0"
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negative = False
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if num < 0:
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negative = True
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num = -num
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binary: list[int] = []
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while num > 0:
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binary.insert(0, num % 2)
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num >>= 1
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if negative:
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return "-0b" + "".join(str(e) for e in binary)
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return "0b" + "".join(str(e) for e in binary)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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