How do I convert a signed decimal integer to 16-bits binary in Python?
bin() function is pretty basic and just adds a "-" before the number.
My requirement is:
Suppose we have a number -4, then output should be 1000000000000100.
That is, MSB is sign bit and rest magnitude bits.
I have tried the common masking technique but it gives 2’s complement and extension of 1’s in the significant bits.
For example, print(bin(-7 & 0b1111111111111111).replace("0b",""))
Output: 1111111111111001
>Solution :
Add leading zeros through the format, and then add sign bit according to the positive and negative:
>>> def to_bin(val):
... b = bin(val).split('b')[1][-15:]
... p = '0' if val >= 0 else '1'
... return p + format(b, '>015')
...
>>> to_bin(-7)
'1000000000000111'
>>> to_bin(-4)
'1000000000000100'
>>> to_bin(4)
'0000000000000100'
>>> to_bin(2 ** 16) # overflow
'0000000000000000'
>>> to_bin(2 ** 16 - 1)
'0111111111111111'