CS208 Introduction to Computer Systems
Friday, 15 September 2023

--->> Hack4Impact

+ C questions
- arrays in C
    - allocating
    - initializing
    - change values of an array
    - swapping entries
    - dynamically enter elements into the array
- running Makefile
    - and what does it want?
- when you can use =, when do you need strcpy etc.
- comparing chars, some warning about ints
    typecasting?
- char initialization vs. char * initialization
    'M' vs. "M"
- when to use pointer, when array?

+ Easy C (given Java knowledge)
    - loops
    - declaration and initialization of primitive types
        (int, char, double, float, long,...)
    - if-statements
    - basic function declaring and calling

+ Hard C
    - * vs. []
    - null-terminated strings
    - pointers

+ C topics
- null-terminated strings
    - char s[10]
    - char *s
    - ??
- command-line arguments, argc, argv
- files: open, read, write, close
- strings: declare, initialize, copy, concatenate, length, compare
- 2D arrays

+ Left-over questions

+ Quick intro to Queues in C assignment

+ Integers
- Base 2 (binary)        111011
- Base 8 (octal)             73
- Base 10 (decimal)          59
- Base 16 (hexadecimal)      3b
- Octal: 3-bit chunks, 0 notation, %o in printf
- Hexadecimal: 4-bit chunks, 0x notation, %x and %X in printf, RGB color representation

+ char, byte, character
- ASCII
- Unicode (much more next week)
- od (Unix command)
- hexdump (Unix command)