Given some input string representing a binary number, $bin, verify it only contains 1 & 0, to protect little Bobby Tables, then convert to an ordinary number. You only have 15 values to deal with, so you can hardcode an array. If it's 10 to 20 bits, you can precompute the array; if it's more, probably better to stick with calculating things as you need them, possibly with memoizing.

my @block = qw( D C CD B BD BC BCD A AD AC ACD AB ABD ABC ABCD );
unshift @block, '';   # empty string for 0

$bin =~ m{([01]+)};     # untaint input
my $idx = eval "0b$1";

my $result = $block[$idx];

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As Occam said: Entia non sunt multiplicanda praeter necessitatem.

In reply to Re: Reading Binary by TomDLux
in thread Reading Binary by BoulderBuff64

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