CS208 Introduction to Computer Systems
Monday, 19 January 2026

+ Sign extension headaches
- printing-bytes.c
- int x = 0x80000000; x = x >> 4; ...

+ Homework questions

+ Recap
- bits, bytes
- integer bases: binary, decimal, octal, hexadecimal
- C general structures
- bitwise operators in C: ~, |, &, ^, >>, <<
- byte order ("endianness")
- two's complement representation of integers
- characters: international standards, codepoints, and character encodings


+ Pointers
- Recall: what's an address?
- C syntax: & to get an address
    int n = 17;
    int *p = &n;

- C syntax: * to "dereference" an address
    If I have p pointing to an int
       *p gives me that int

- Let's look at pointers.c
...