That doesn't work:

>perl -le "print(unpack('%32b*', 0x13))"
7

[download]

There are 3 bits set in 0x13, not 7.

Sorry, my mistake.

>perl -le "print(unpack('%32b*', chr(0x13)))"
3

[download]

In reply to Re^2: counting set bits in binary file by ikegami
in thread counting set bits in binary file by dwhite20899

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