Some corrections:

1. On the PIC microcontroller that FIRST uses, double is an alias for float (they're the same exact thing, both 32 bit).

2. pg. 14 - c= (char)counter - will simply cause an overflow to "wrap" around, not cause an error (I think)

3. What about pointers? I think they're important enough to be included (I included them in my guide - plug ).