09-09-25 Lab 4

Class: CSCE-312

Notes:

57 Unsigned -> 0011 1001

-57 -> Use 2's complement

• 1's complement: Invert all bits
  • 1100 0110
• Now add 1 to these bits (+1):
  • 1100 0111

9 - 7 -> 9 + (-7)

• It is easier to do addition rather than subtraction
• 9: 1001
• 7: 0111
• -7: Use 2's complement
  • Add one bit
  • 1's complement: Invert all bits
    • 11000
  • Now add 1 to these bits (+1)
    • 11001
• 9 + (-7)
  • 01001
  • 11001
  • = 100010 = 2