CS208 Introduction to Computer Systems
Wednesday, 18 Jan 2023

+ Today
- bitwise operations
- UTF-8
- Floating point representation

+ Questions

+ Weird, handy thing

    int k = 57;
    printf("%p\n", &k);

    int numbers[4] = {100, 35, 27, -14};
    for (k = 0; k < 4; k++) {
        printf("%p\n", &numbers[k]);
    }

+ Bitwise operations
- &, |, ^, ~

+ UTF-8
- Character encoding revisited
- Problems with ASCII, UTF-16LE, UTF-16BE
- How UTF-8 works
- Advantages & disadvantages
- Try it
    put a non-ASCII character
    (é è ñ α...) into a file
    research the character's codepoint
    translate that codepoint into UTF-8
    is that what you see in "hexdump -C filename"?

+ Floating point numbers

+ Recap