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Re^4: Efficient bit counting with a twist.by BrowserUk (Patriarch) |
on Jun 01, 2013 at 09:49 UTC ( [id://1036400]=note: print w/replies, xml ) | Need Help?? |
What is going on here? I tweaked your code by adding a couple of extra print statements:
And when I run it I get this output:
hex converts the string '0xff' to a number which you store in $mask; unpack expects a string, so perl helpfully converts the number stored in $mask to a string in the default decimal representation '255'. You are counting the bits in that 3 byte string. To count the bits in the number, you need to tell perl that you want the binary representation of that number:
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