How to convert two's complement binary to decimal in ruby? -


what easiest way convert two's complement binary decimal? example, if convert string such as"1001" decimal i'll 9. i'm trying simple -7. guys suggest?,

from question looks using 4 bit system.
might work you, got results asking for.
here 2 functions, 1 4 bit , 1 16 bit twos' complement. 

  # 4 bit   def convert_4bit_to_signed_binary(binary)     binary_int = binary.to_i(2)     if binary_int >= 2**3 # 4 bit       return binary_int - 2**4     else       return binary_int     end   end    # 16 bit   def convert_16bit_to_signed_binary(binary)     binary_int = binary.to_i(2)     if binary_int >= 2**15 # 4 bit       return binary_int - 2**16     else       return binary_int     end   end    = convert_4bit_to_signed_binary('1001')   # give -7   j = convert_16bit_to_signed_binary('1001')  # give 9    puts   puts j

let me know if works you?


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