Low Level Bit Hacks You Absolutely Must Know

You're viewing a comment by Peteris Krumins and its responses.

July 03, 2009, 17:16

John Doe, I am still not sure what you mean. It does what it says - turns off the rightmost 1-bit. It does not modify other bits.

Andrew, thanks for collection but I see several problems with Python's solution and Perl's solution.

As I wrote in an earlier comment bin() is a feature of Python 2.6 and bin(-x) is just -bin(x) that does not show the representation of negative numbers.

The problem with Perl's is that it shows too many bits 1-bits for negative numbers and you want to limit that. On a 64 bit machine -1 gets printed as 11111111111111111111111111111111111111111111111111111111111111.

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