Question

Convert to 8 bit binary and perform integer subtraction on 140-235. Does overflow happen?

Answer 1

To obtain the 2's complement of a number:
First obtain it's 1's complement( i.e interchanging 0's to 1's and 1's to 0's for it's binary number) & then add 1 to that 1's complement

For Binary addition

Addition	Sum	Carry
0+0	0	0
0+1	1	0
1+0	1	0
1+1	0	1

From the above Result it is having 8-bits only. So there is no overflow Occurs