I think I get it now, except how -128 can be represented.
1000 0000 (128base 10)
0111 1111 (1's comp)
1000 0000 (twos comp)
So when calculating the complements you ignore the eigth bit representing the sign? The why isn't it 128 to -128??
This is really giving me the shits, i had the same problem, we were taught that the 8th bit is used to represent negative or positive, made me confused when the teacher isn't teaching it that way. Saying it will overflow etc.
Oh also can you explain to me why 1000 0000 is -128?