In general, it may be useful to know what "MSB" means, because it depends on the machine. The following should be a simple and portable method of converting any unsigned integer to its binary representation:

sub dec2bin
{
  return sprintf("%b", $_[0]);
}

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In reply to Re: calculating the 3 MSBs from an integer by spurperl
in thread calculating the 3 MSBs from an integer by insaniac

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