Visualizing Unsigned Addition P68 Figure 2.16 Overflow Wraps around If true sum≥2Ww Addu, v) At most once True Sum 2 W+1 Overflow 64208 0 Modular sum Module:取模5 Visualizing Unsigned Addition P68 Figure 2.16 • Wraps Around – If true sum ≥ 2w – At most once 0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14 16 UAdd4 (u , v) u v Overflow 0 2 w 2 w+1 True Sum Modular Sum Overflow Module: 取模