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28 lines
628 B
Python
28 lines
628 B
Python
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def excess_3_code(number: int) -> str:
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"""
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Find excess-3 code of integer base 10.
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Add 3 to all digits in a decimal number then convert to a binary-coded decimal.
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https://en.wikipedia.org/wiki/Excess-3
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>>> excess_3_code(0)
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'0b0011'
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>>> excess_3_code(3)
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'0b0110'
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>>> excess_3_code(2)
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'0b0101'
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>>> excess_3_code(20)
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'0b01010011'
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>>> excess_3_code(120)
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'0b010001010011'
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"""
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num = ""
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for digit in str(max(0, number)):
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num += str(bin(int(digit) + 3))[2:].zfill(4)
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return "0b" + num
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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