How to resolve the algorithm Two's complement step by step in the Z80 Assembly programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Two's complement step by step in the Z80 Assembly programming language
Table of Contents
Problem Statement
Two's complement is an important concept in representing negative numbers. To turn a positive integer negative, flip the bits and add one.
Show how to calculate the two's complement of an integer. (It doesn't necessarily need to be a 32 bit integer.)
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Two's complement step by step in the Z80 Assembly programming language
Source code in the z80 programming language
ld a,%00001111
neg ;returns %11110001 in a
ld a,%00001111
cpl ;game boy doesn't have NEG but it has CPL which flips all the bits.
inc a ;returns %11110001 in a
xor a ;ld a,0
sub c
ld c,a
sbc a ;loads &FF into A if "sub c" set the carry (borrow) flag. Otherwise, a remains zero.
sub b
ld b,a
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