dsi0 ael0

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

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
     

Make y = deadbeef without using “deadbeef” by using the address (&)

 y = &x

Now, y's data is the address of x x contains the data '0'

  |0|
  ---
  x
  0xdeadbeef  <- address
     |0xdeadbeef|
     ------------
     y
     0xcoffee <- address
     
 x = 7;
 *y = 13;

Now:

  |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