Python/conversions/decimal_to_binary.py
Hardik Aggarwal b6ca263983
Update decimal_to_binary.py (#2185)
"an Integer" instead of "a Integer"
2020-07-07 13:26:10 +02:00

60 lines
1.5 KiB
Python

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