CS208 Introduction to Computer Systems
Monday, 10 April 2023

+ Upcoming schedule
- Programming assignment #3: 4/12
- Online quiz (posted today; take as often as you want): 4/16
- In-class exam: 4/19
- Note: new OAR rules--student has to request exam 72 hours ahead

+ Today
- integers
- questions about the bits assignment

+ Two's complement integers
- Negate: complement all bits, then add 1
- This is weird; why do we do this?
- Practice with 8-bit numbers
    - 0xED (interpreted as 8-bit 2's comp) = ? base ten 
    - -29 = 0b...?
- Say things like this
    - "the bit pattern 11111011, interpreted as an 8-bit
        two's complement integer, represents -5"
    - "the hexadecimal expression of the bit pattern 11111011
        is 0xFB"

+ integer lab: 15-20 minutes
- introduce yourself to somebody next to you
- pick one person's computer
- do this lab together

+ integers in C
- typecasting & promotion
- chaos when printing a single byte
- chaos when doing bit manipulations on