ece150: add pointers

docs/ce1/ece150.md

@@ -169,3 +169,37 @@ The return value of the function overwrites whatever is at the bottom of the fun
 C-style strings are char arrays that end with a **null terminator** (`\0`). By default, char arrays are initialised with this character.
 
 If there is not a null terminator, attempting to access a string continues to go down the call stack until a zero byte is found.
+
+## Dynamic allocation
+
+Compared to static memory allocation, which is done by the compiler, dynamic memory is managed by the developer, and is stored between the call stack and data segment in the **heap**.
+
+## Pointers
+
+!!! definition
+    - A **pointer** is a variable that stores a memory address.
+
+The asterisk `*` indicates that the variable is a pointer address and can be **dereferenced**. `&` can convert an identifier to a pointer.
+
+```cpp
+int array[10];
+int *p_array{array};
+
+int num{2};
+int *p_num{&num};
+```
+
+!!! warning
+    Only **addresses** should be passed when assigning pointer variables — this means that primitive types must be converted first to a reference with `&`.
+
+The default size of a pointer (the address size) can be found by taking the `sizeof` of any pointer.
+
+```cpp
+sizeof(int*);`
+```
+
+The memory at the location of the pointer can be accessed by setting the pointer as the lvalue:
+
+```cpp
+*var = 100;
+```