2's Compliment in Ruby

[aronb]

Hi,

How do you do 2's Compliment conversion in Ruby ?

I have a 16bit 2's compliment number that needs to be signed integer -32768 to 32767

thanks for any input...

Aron

[KG_is_back]

Numbers in ruby are 2's compliment. If I assume correctly, your 16bit signed number is being displayed in unsigned format? If that is correct, simply subtract 2^16 in number is above or equal 2^15

Code: Select all

def unsigned_to_signed(x,bitdeapth)
if x>2**(bitdeapth-1)
x-2**bitdeapth
else
x
end
end



[aronb]

Thank You KG_is_back ! ! !

I initially did the > test incorrectly... DOH

Works perfectly now

Have a great weekend,

Aron