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use strict;
use warnings;
...
print reverse split '', unpack'b*', pack'c', $val;
print "\n";
}

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C:\>perl test.pl
                Zero :    0 => 00000000
...
             Or-ed 1 :    5 => 00000101
             shift 1 :   10 => 00001010
             Or-ed 0 :   10 => 00001010