Unsigned vs Signed byte numbers

[ckaiser813]

some one tell me if this is right

this is the binary number 11111111

unsigned = 255 (decimal)

signed = -1 (decimal)

is this correct because in my book it says to take the opposite so all 1's become 0's then you add 1 in the LSD.

 

[mgb_phys]

Assuming the machine uses twos complement - yes

 

[ckaiser813]

yeah it is thanks for the help