Revisions to Base-2 integer logarithm of 64-bit unsigned integer

replaced http://codegolf.stackexchange.com/ with https://codegolf.stackexchange.com/

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edited Apr 13, 2017 at 12:39

Python 3, 38 bytes

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1. (a,b)[condition] is a trick I took from Tips for golfing in Python Tips for golfing in Python.

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1. (a,b)[condition] is a trick I took from Tips for golfing in Python.

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1. (a,b)[condition] is a trick I took from Tips for golfing in Python.

added 134 characters in body

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edited Jul 27, 2014 at 2:41

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1. (a,b)[condition] is a trick I took from Tips for golfing in Python.

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1.

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1. (a,b)[condition] is a trick I took from Tips for golfing in Python.

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created Jul 27, 2014 at 2:25

def f(n):return(-1,len(bin(n))-3)[n>0]

bin(n) produces a string like 0b100, so you have to subtract 3, not just 1.