Computer Architecture # 03 : Arithmetic: FIXED POINT ADDITION AND SUBTRACTION (2)

3.2 FIXED POINT ADDITION AND SUBTRACTION
The addition of binary numbers and the concept of overflow were briefly discussed in Chapter 2. Here, we cover addition and subtraction of both signed and unsigned fixed point numbers in detail. Since the two’s complement representation of integers is almost universal in today’s computers, we will focus primarily on two’s complement operations. We will briefly cover operations on 1’s complement and BCD numbers, which have a foundational significance for other areas of computing, such as networking (for 1’s complement addition) and hand-held calculators (for BCD arithmetic.)