CS208 Introduction to Computer Systems
Monday, 8 January 2024

+ This week
- No office hours Wednesday
- Job candidate talk: underwater robots!
    4:30-5:30 Tuesday, AND 329

+ Questions

+ Bases
- Ten (decimal), sixteen (hexadecimal), two (binary)

    39 : 3 tens and 9 ones = 3 * 10^1 + 9 * 10^0
    0x27 : 2 sixteens and 7 ones = 2 * 16^1 + 7 * 16^0
    0b100111 : 1 * 2^5 + 0 * 2^4 + 0 * 2^3 + 1 * 2^2 + 1 * 2^1 + 1 * 2^0
                32         0         0         4          2        1

    Base sixteen: 0 1 2 3 4 5 6 7 8 9 A B C D E F  (or a b c d e f)
    
    Base two    : 0 1

Convert 0xA5 to decimal
    0xA5 = 10*16 + 5 = 165

Convert 0xA53 to decimal
    0xA53 = 10*256 + 5*16 + 3 = 2643
          = 16*(165) + 3

Why?
    


- Converting between bases

+ Memory
- Bits
- Bytes
- Memory = big bunch of bytes with addresses 0, 1, 2,..., 2^N - 1
- char, byte, character
- ASCII

+ Strings and pointers
- strings.c
- sizes.c
- charstar.c
- pointers.c

+ Debugging lab