How do I convert bits into ints?

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How do I convert bits into ints?

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Question:

How can I convert a number from binary format (0 and 1) to decimal?

Answer:

You need to use pack() the data to an eight bit binary structure then unpack it to the desired target structure with unpack() - or if the target is decimal, you can use ord().

A few words on pack(). This function is very useful when processing CGI posted data, since this is often escaped. The first argument in pack() is a template. There are quite a few values - for a full documentation look here:

http://www.perldoc.com/perl5.6.1/pod/func/pack.html

# convert from binary to decimal
$decimal = unpack('c', pack('B8', '10110110'));  

# same functionality but using ord()
$decimal = ord(pack('B8', '10110110'));

# from hex to binary
$binary_string = unpack('B', "\x41");  


# unescaping CGI data
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($value))/eg;

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