Created
September 1, 2013 14:49
-
-
Save azakordonets/6404904 to your computer and use it in GitHub Desktop.
convert a decimal (denary, base 10) integer to a binary string (base 2)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# convert a decimal (denary, base 10) integer to a binary string (base 2) | |
# tested with Python24 vegaseat 6/1/2005 | |
def Denary2Binary(n): | |
'''convert denary integer n to binary string bStr''' | |
bStr = '' | |
if n < 0: raise ValueError, "must be a positive integer" | |
if n == 0: return '0' | |
while n > 0: | |
bStr = str(n % 2) + bStr | |
n = n >> 1 | |
return bStr | |
def int2bin(n, count=24): | |
"""returns the binary of integer n, using count number of digits""" | |
return "".join([str((n >> y) & 1) for y in range(count-1, -1, -1)]) | |
# this test runs when used as a standalone program, but not as an imported module | |
# let's say you save this module as den2bin.py and use it in another program | |
# when you import den2bin the __name__ namespace would now be den2bin and the | |
# test would be ignored | |
if __name__ == '__main__': | |
print Denary2Binary(117) # 11111111 | |
# convert back to test it | |
print int(Denary2Binary(255), 2) # 255 | |
# this version formats the binary | |
print int2bin(255, 12) # 000011111111 | |
# test it | |
print int("000011111111", 2) # 255 | |
# check the exceptions | |
print Denary2Binary(0) | |
print Denary2Binary(-5) # should give a ValueError |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment