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  1. or download this
    C 7654 3210
  1110 1111 =  0xEF = decimal 239
...
1 1101 1110 left shift one showing carry

  1101 1110 result without carry = 0xDE = 222
  2. or download this
    #!/usr/bin/perl -w
use strict;
...
   }
   return $bit;
}
  3. or download this
    #!/usr/bin/perl -w
use strict;
...

printf ("%X\n", $input<<1 & $mask);
# prints DE which means 222 in decimal
  4. or download this
    printf ("%X\n", 0xEF<<1 & 0xFF);
# prints DE which means 222 in decimal