### Question 5.15

I'm confused. I just can't understand all this null pointer stuff.

Follow these two simple rules:

1. When you want a null pointer constant in source code, use ```0`'' or ```NULL`''.
2. If the usage of ```0`'' or ```NULL`'' is an argument in a function call, cast it to the pointer type expected by the function being called.

The rest of the discussion has to do with other people's misunderstandings, with the internal representation of null pointers (which you shouldn't need to know), and with ANSI C refinements. Understand questions 5.1, 5.2, and 5.4, and consider 5.3, 5.9, 5.13, and 5.14, and you'll do fine.

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