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  1. or download this
    my $neg = -1;
my $negBin = sprintf ("010.10b", $neg);
print $negBin; #returns a lot of 1s instead of 11_1111_1111. (without 
+underscores)
  2. or download this
    my $num = 1024;
my $bin = sprintf ("010.10b", $num);
print $bin; #returns 100_0000_0000 instead of 00_0000_0000