Lab46 Wiki

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<WRAP><color red><fs 200%>Corning Community College</fs></color></WRAP>
<WRAP><fs 150%>CSCS2320 Data Structures</fs></WRAP>
<fs 125%>Course Wiki Page</fs>
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======Projects======
dsi0
ael0
======URLs======
Binky Pointer Video:

[[https://www.youtube.com/watch?v=f-pJlnpkLp0|Binky Pointer Video]]

[[https://www.learn-c.org/en/Linked_lists|Basic linked list tutorial ]]
======Notes======
====Pointers:====

char x = 0;

char -> 1 byte (8 bits)
Default char -> signed (2^8 -> 256 -> -128, +127 [one is used for positive/negative value])

the asterisk (*) indicates a "pointer"
    signed char *y = NULL;
                ^
                                
(void*)0
Void pointers are raw memory

    |0|
    ---
    x
    0xdeadbeef
       |NULL(0)|
       ---------
       y
       0xcoffee
       
Access an address with &

Make y = deadbeef without using "deadbeef" by using the address (&) my man.

   y = &x
Now, y's data is the address of x.

x contains the data '0'

If we do this:
    |0|
    ---
    x
    0xdeadbeef  <- address
       |0xdeadbeef|
       ------------
       y
       0xcoffee <- address
       
   x = 7;
   *y = 13;

Then:
    |13|
    ----
    x
    0xdeadbeef  <- address
       |0xdeadbeef|
       ------------
       y
       0xcoffee <- address

x is now 13 because y is x's address, and you 'pointed' 13 to the address. Ill, dog.


Double pointers are arrays or whatever
    |          |
    ------------
    z
    
    signed char **z = NULL;
    
So we're gonna give this some garbage
    |0xcoffee|
    ----------
    z
    0xc05fefe
And do nothing with it because we kind of just stopped I think.
    
Memory addresses are 8 bytes on 64 bit linux systems.
4 bytes on 32 bit linux systems.
======Other======