Using 4-bit calculator with 2's complement, For example, when putting -5 (1011) plus -2 (1101) in calculator, End-carry comes out 10011 In My book, It says with 1's complement you have to add this End-carry again. But with 2's complement you just ignore End-carry. But In the book, reason for ignoring is not written... Sure, I know that when you ignore the end-carry It's the answer. Is there any other reason for ignoring end-carry?
Is there any proof for ignoring end-carry?