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added automated doctest to decimal_to_hexadecimal.py in conversions (#1071)
* added automated doctest to decimal_to_hexadecimal.py in conversions * improved error handling and added more test cases in decimal_to_hexadecimal.py * implemented 0x notation and simplified AssertionError * fixed negative notation and added comparison test against Python hex function
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@ -21,23 +21,54 @@ values = {
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}
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def decimal_to_hexadecimal(decimal):
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""" take decimal value, return hexadecimal representation as str """
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"""
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take integer decimal value, return hexadecimal representation as str beginning with 0x
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>>> decimal_to_hexadecimal(5)
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'0x5'
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>>> decimal_to_hexadecimal(15)
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'0xf'
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>>> decimal_to_hexadecimal(37)
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'0x25'
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>>> decimal_to_hexadecimal(255)
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'0xff'
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>>> decimal_to_hexadecimal(4096)
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'0x1000'
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>>> decimal_to_hexadecimal(999098)
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'0xf3eba'
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>>> # negatives work too
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>>> decimal_to_hexadecimal(-256)
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'-0x100'
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>>> # floats are acceptable if equivalent to an int
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>>> decimal_to_hexadecimal(17.0)
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'0x11'
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>>> # other floats will error
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>>> decimal_to_hexadecimal(16.16) # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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AssertionError
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>>> # strings will error as well
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>>> decimal_to_hexadecimal('0xfffff') # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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AssertionError
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>>> # results are the same when compared to Python's default hex function
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>>> decimal_to_hexadecimal(-256) == hex(-256)
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True
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"""
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assert type(decimal) in (int, float) and decimal == int(decimal)
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hexadecimal = ''
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negative = False
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if decimal < 0:
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negative = True
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decimal *= -1
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while decimal > 0:
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remainder = decimal % 16
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decimal -= remainder
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decimal, remainder = divmod(decimal, 16)
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hexadecimal = values[remainder] + hexadecimal
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decimal /= 16
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hexadecimal = '0x' + hexadecimal
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if negative:
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hexadecimal = '-' + hexadecimal
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return hexadecimal
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def main():
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""" print test cases """
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print("5 in hexadecimal is", decimal_to_hexadecimal(5))
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print("15 in hexadecimal is", decimal_to_hexadecimal(15))
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print("37 in hexadecimal is", decimal_to_hexadecimal(37))
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print("255 in hexadecimal is", decimal_to_hexadecimal(255))
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print("4096 in hexadecimal is", decimal_to_hexadecimal(4096))
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print("999098 in hexadecimal is", decimal_to_hexadecimal(999098))
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if __name__ == '__main__':
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main()
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import doctest
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doctest.testmod()
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