Ruby zero pad a number and convert it to binary

address conversion

# add leading zeros to a number

def zero_pad(target_length, input_string)
	pad_length = target_length - input_string.length
	"0" * pad_length + input
end


# convert a number to binary

address.to_i.to_s(2) 

#to_i converts the string to an integer
#to_s(2) converts the integer in base 2 to a string

There are built-in solution for this:

1.9.2-p320 :002 > sprintf("%b", 2435)
 => "100110000011" 

1.9.2-p320 :001 > sprintf("%.15b", 2435)
 => "000100110000011"