in reply to Converting negative number to binary with specific width

I prefer bit-bashing to string-bashing. Whatever floats your boat.

printf '%0*b', $bits, $num & ((1<<$bits)-1)

Replies are listed 'Best First'.
Re^2: Converting negative number to binary with specific width
by Anonymous Monk on Nov 03, 2015 at 15:28 UTC

    If you insist on strings, substr is still probably easier than pack.

    substr(sprintf("%0*b", $bits, $num), -$bits)
[reply]
[d/l]

In Section Seekers of Perl Wisdom