I was thinking something more along the lines of 

c:\@Work\Perl\monks>perl -wMstrict -le
"for my $n (-2, -1, 0, 1, 2, 1023, 1024, 1025) {
   my $bin = reverse unpack 'b10', pack 'v', $n;
   print qq{'$bin' <= $n};
   }
"
'1111111110' <= -2
'1111111111' <= -1
'0000000000' <= 0
'0000000001' <= 1
'0000000010' <= 2
'1111111111' <= 1023
'0000000000' <= 1024
'0000000001' <= 1025

[download]
to get closer to the  'b' formatting of sprintf (although I'm not sure this is any better than substr-inging it). (Update: Also see perlpacktut.)

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: Converting negative number to binary with specific width by AnomalousMonk
in thread Converting negative number to binary with specific width by pjkang7

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