Example C code using pointers

1. Integer Pointers
   
   A simple example that shows what a pointer is.
2. Arrays of arbitrary lengths
   
   This example shows how to construct arrays of arbitrary lengths using pointers.
3. Passing variables by reference
   
   If we have a variable x and we pass the address of x to a function, then that function can edit the value of x.
4. Pointers and structures
   
   This example shows how to work with pointers to structures.
5. A polygon example
   
   This provides an example of a self-referential pointer.

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